In March 2020, the schools shut and I had nothing to do. I was in grade 6 and the world had become my home and a screen. I found myself, like many people that year, spending hours on YouTube following one recommendation to the next. At some point I ended up watching a video about black holes — not a particularly good video, as I recall, more spectacle than substance — and then another, and then a documentary about the Voyager probes, and then Carl Sagan’s Cosmos, which I did not fully understand but could not stop watching. By the time the lockdown lifted I was staying up past midnight trying to complete my observation of the messier catalogue.

That was how it started. Not with a teacher, not with a textbook, not with a telescope. With time and a screen and a curiosity that I had not known was there.

What follows is everything I know about how to actually learn astronomy — not the version where you read a popular book and feel like you understand the universe, but the version where you can look at a telescope, use it, understand what you are seeing, and eventually connect it to the physics and the research. I have tried to be honest about the difference between those two things throughout.

Part I — First Contact

How Not to Start

Most people start with a 70mm department-store refractor with a 300× magnification claim on the box, go outside on a cloudy night, cannot find anything, and conclude that astronomy is not for them.

Do not do this.

The telescope is not the beginning. Your eyes are the beginning. The sky is the beginning. Before you buy anything or read anything technical, spend a few nights outside looking at the sky with nothing in your hands.

This sounds obvious. Almost nobody does it. Almost everybody skips straight to equipment or books.

What to Do in the First Month

Learn the sky naked-eye. Go outside after dark, give your eyes twenty minutes to adjust, and just look. Learn to find the North Star (Polaris) — not by knowing which star it is, but by noticing that it does not move while everything else rotates around it. Learn one or two constellations by their actual pattern of stars, not by the cartoon overlays. Learn to see the difference between stars (which twinkle) and planets (which generally do not, because they have a disc large enough to average out the atmospheric turbulence).

Download Stellarium. stellarium.org. Free and available on every platform. Point it at the sky and it shows you what you are looking at. Use it to plan what to look for — what planets are visible tonight, when the Moon rises, what is at zenith right now. It is the single most useful tool I have used in observational astronomy. used binoculars for a few months before getting a telescope, and I do not regret it.

Watch these first:

  • Carl Sagan’s Cosmos: A Personal Voyage (1980). Thirteen episodes. The definitive popular introduction to astronomy and cosmology and our place in the universe. The episode on the life of stars (“The Lives of the Stars”) is where my understanding of stellar evolution began.
  • Neil deGrasse Tyson’s Cosmos: A Spacetime Odyssey (2014). A modern continuation. Visually stunning and scientifically reliable.
  • Brian Cox’s BBC series — Wonders of the Solar System, Wonders of the Universe, The Planets. Cox is unusually good at communicating the emotional weight of scientific discovery.
  • 3Blue1Brown’s video on gravity and orbits. Not astronomy per se but the mathematical intuition is exactly right.

Read these first:

  • Cosmos — Carl Sagan (1980). The companion book to the series. More detailed than the episodes and better written than almost anything else in popular science. Read this before anything else.
  • A Brief History of Time — Stephen Hawking. More theoretical than observational — Hawking is explaining cosmology and black holes — but the writing is clear and the ideas are genuinely important.
  • The Planets — Dava Sobel. Beautifully written account of each planet in the solar system, mixing science and poetry. Excellent as a first book specifically about the solar system.

Part II — Learning the Subject Properly

Once you have spent a month outside and read a popular book, the question becomes: how do you actually learn astronomy? Not the pop-science version but the subject itself.

The answer is that astronomy is physics. Every beautiful thing you see — the colour of a star, the shape of a galaxy, the spectral lines in starlight — is a consequence of physics. You can get far without the physics, but you eventually hit a wall where the descriptions stop making sense because you do not understand why things are the way they are.

The sections below are organised from most accessible to most technical.

The Solar System

The Backyard Astronomer’s Guide — Terence Dickinson and Alan Dyer The best single book for a beginner who wants to understand both the sky and the equipment used to observe it. Covers telescopes, binoculars, what to observe in the solar system, deep-sky observing, astrophotography, and more. The sections on the Moon and planets are the most practically useful I have found.

Solar System — Marcus Chown A compact, visually rich introduction to each body in the solar system. Good as a first overview before going deeper.

The Nine Planets — nineplanets.org A free website that has been updated continuously since the early internet. More detailed than most popular books on solar system data. Reliable for facts and basic science.

NASA’s Eyes on the Solar System — eyes.nasa.gov A free 3D simulation of the solar system using real mission data. You can fly alongside the Voyager probes, track real-time positions of spacecraft, and explore the planets and moons in three dimensions. I spent considerable time with this during the lockdown. The sense of scale it builds is irreplaceable.

NASA Planetary Photojournal — photojournal.jpl.nasa.gov Every planetary image ever taken by a NASA mission, searchable by target and instrument. The Mars images from Curiosity and Perseverance, the Saturn rings from Cassini, the Pluto flyby from New Horizons — all here, in full resolution.

Stars and Stellar Evolution

An Introduction to Stars — the ESA/NASA educational resources at esahubble.org and hubblesite.org

Stars and Their Spectra — James Kaler The most accessible technical treatment of stellar spectral types and what they tell you about a star’s physical properties. Kaler explains how astronomers use the spectrum of a star to determine its temperature, chemical composition, distance, and evolutionary state. This is the book where I first understood how the Hertzsprung–Russell diagram works as a tool rather than just a classification scheme.

The Physics of Stars — A.C. Phillips A compact undergraduate treatment of stellar structure and evolution — how a star generates energy through nuclear fusion, how it maintains hydrostatic equilibrium, what happens when the fusion runs out. The mathematics requires some calculus but the concepts are clear.

Understanding the Hertzsprung-Russell Diagram. The H-R diagram is the central organisational tool of stellar astronomy — it plots luminosity against temperature and reveals the structure of stellar evolution in a single image. Every astronomer carries a working mental model of this diagram. If there is one thing to understand properly before going further in stellar astronomy, it is this.

Deep Sky Objects

NightWatch — Terence Dickinson The most recommended beginner’s observing guide. Contains detailed star charts, explanations of what you are looking at, and practical advice on using binoculars and telescopes. The section on finding deep-sky objects — star clusters, nebulae, galaxies — with modest equipment is excellent.

Turn Left at Orion — Guy Consolmagno and Dan Davis A practical guide to finding 100 deep-sky objects with a small telescope, using the “star-hopping” technique — navigating from bright, easily identified stars to the object you want by following a chain of visible reference points. This is the most practical telescope guide I have used.

The Messier Catalogue. Charles Messier compiled his catalogue of 110 nebulae and star clusters in the 18th century specifically so he would not mistake them for comets. It has become the standard checklist for amateur astronomers: the Orion Nebula (M42), the Andromeda Galaxy (M31), the Crab Nebula (M1), the Pleiades (M45). Completing the full Messier list is a rite of passage. A “Messier Marathon” — observing all 110 objects in a single night, done near the spring equinox when they are all visible — is one of the most challenging observational exercises in amateur astronomy(though I myself attempted it but failed miserably).

Simbad Astronomical Database — simbad.u-strasbg.fr The professional database for stellar and deep-sky object data. Every named and catalogued astronomical object, with coordinates, magnitudes, spectral types, cross-references. Once you move beyond the Messier catalogue, this is where you look things up.

Cosmology

The Big Bang — Simon Singh The clearest non-technical account of the history and evidence for the Big Bang theory. Singh traces the scientific story from Hubble’s discovery of the expanding universe through the discovery of the CMB. Highly recommended as a bridge between popular and technical cosmology.

Cosmology — Steven Weinberg (the popular book, The First Three Minutes, 1977) Weinberg explains what happened in the first three minutes after the Big Bang — the nucleosynthesis of hydrogen and helium — with more technical precision than any other popular book. It remains the best popular treatment of early-universe cosmology.

An Introduction to Cosmology — Ryden The standard undergraduate cosmology textbook. Covers the expanding universe, the FRW metric, the thermal history of the universe, dark matter and dark energy, and inflation. Requires some calculus. The most accessible serious treatment.

Part III — Practical Observing

This is the part that most resources skip. Books and videos tell you about the universe; this section is about actually looking at it.

Equipment

Binoculars. Start here. 7×50 binoculars (7× magnification, 50mm aperture) are good choice. They show you the Moon’s craters, Jupiter’s four Galilean moons (Io, Europa, Ganymede, Callisto — the ones Galileo discovered), the Pleiades as a rich cluster rather than a hazy patch, and the Andromeda Galaxy as a faint smudge. Under dark skies, they reveal the structure of the Milky Way.

Your first telescope. A 6-inch (150mm) or 8-inch (200mm) Dobsonian reflector is the standard recommendation and it is correct. A Dobsonian is a Newtonian reflector on a simple altitude-azimuth mount. It is inexpensive relative to its aperture, mechanically simple, and gives you more light-gathering power per rupee/dollar than any other design. My first telescope was a Dobsonian and I still use it. The trade-off is that it requires manual tracking — you move it by hand to follow objects as the Earth rotates.

Avoid:

  • Telescopes sold by magnification rather than aperture. A 300× claim is meaningless; aperture (the diameter of the primary mirror or lens) is what matters.
  • Equatorial mounts for a first telescope. They are powerful but the learning curve is steep. Start with the simplicity of a Dobsonian.
  • GoTo computerised mounts as a substitute for learning the sky. They are useful once you know what you are doing; as a first telescope they teach you to press buttons instead of understanding the sky.

Eyepieces. A telescope comes with one or two eyepieces. The quality of the included eyepieces is often mediocre. A good 25mm Plössl eyepiece (for low-power, wide-field views) and a 10mm or 8mm eyepiece (for higher power on planets and double stars) will dramatically improve what you see. Eyepieces from Baader, Celestron, or Orion in this price range are reliable.

Dark skies. The single most important upgrade you can make to your observing setup is not a better telescope — it is getting away from city lights. Light pollution is the primary limiting factor for most observers. The Bortle scale (1–9) measures sky darkness; most cities are Bortle 8 or 9 (white sky, the Milky Way invisible), and even getting to Bortle 4 or 5 dramatically changes what is visible. Light pollution maps at lightpollutionmap.info show you the nearest dark sky sites.

Though for me personally the challenge was doing that living in Delhi, and it was not really possible to observe anything beyond the Moon and planets; but it became one of the most compelling reasons I learned to drive.

What to Observe

The Moon. The most rewarding object for a beginner with any telescope. The craters, mountains, and maria are visible even at 50×. The best time to observe is near first or last quarter, when the terminator (the line between light and dark) creates the most dramatic shadows. Do not observe the Moon when you are trying to see faint deep-sky objects — it washes out the sky for hours afterward.

The Planets.

  • Jupiter is the most rewarding planet for a small telescope. Four moons, visible every clear night, changing positions from one night to the next. The cloud bands are visible at 100×. The Great Red Spot requires a 6-inch or larger and good conditions.
  • Saturn and its rings. First seeing Saturn’s rings through a telescope is one of the defining experiences of amateur astronomy. They look too perfect to be real. The Cassini Division (a gap in the rings) is visible in a 4-inch or larger.
  • Mars is rewarding near opposition (when it is closest to Earth) but disappointing at other times — it is simply too small.
  • Venus shows phases like the Moon (visible in binoculars). It never shows surface detail because of its thick clouds.
  • Mercury is challenging — always close to the Sun, low on the horizon. Best seen at greatest elongation.

Double Stars. Pairs of stars (some physically bound, some just line-of-sight coincidences) that appear as single stars to the naked eye but split into two in a telescope. Albireo (in Cygnus) is the classic beginner double — one star is blue-white, the other gold. Double stars are excellent targets in light-polluted skies where deep-sky objects are washed out.

Star Clusters. The Pleiades (in Taurus) in binoculars. The Hyades. The Beehive Cluster (M44 in Cancer). Globular clusters — vast spherical concentrations of hundreds of thousands of stars, orbiting outside the Milky Way’s disc — are spectacular in a 6-inch or larger: M13 in Hercules, M5 in Serpens, ω Centauri (from southern latitudes).

Nebulae. The Orion Nebula (M42) is visible to the naked eye from dark skies and spectacular in any telescope. It is a region of active star formation — the glowing gas is ionised by the young, hot stars at its centre. The Crab Nebula (M1 in Taurus) is the remnant of a supernova observed in 1054 CE by Chinese astronomers.

Galaxies. Beyond our own Milky Way. The Andromeda Galaxy (M31) is visible to the naked eye from dark skies as a faint patch — it is the most distant object visible without optical aid (about 2.5 million light-years). In a telescope from dark skies you can see its two satellite galaxies, M32 and M110.

Keeping an Observing Log

An observing log is one of the habits that separates serious amateur astronomers from casual ones. It does not need to be elaborate — date, time, location, sky conditions (seeing and transparency), objects observed, what you saw, sketches if you make them. The cumulative record is valuable: you begin to notice patterns (Jupiter’s moons changing configuration, the seasonal appearance of familiar constellations) and your ability to describe what you see improves steadily.

I keep mine in a simple notebook. The discipline of writing down exactly what you saw — not what you expected to see, not what the book says it looks like, but what was actually in the eyepiece — is harder than it sounds and more valuable than it sounds.

Part IV — Moving Toward Research

Citizen Science

Professional astronomy generates more data than professional astronomers can analyse. Several programmes exist that allow amateur observers and non-specialists to contribute meaningfully to ongoing research:

Galaxy Zoo — zooniverse.org/projects/zookeeper/galaxy-zoo Classify galaxies from surveys including the Sloan Digital Sky Survey and the Hubble Space Telescope. Human pattern recognition is still better than current algorithms for some classification tasks. Several peer-reviewed papers have been produced from Galaxy Zoo classifications.

Planet Hunters TESS — zooniverse.org/projects/nora-dot-eisner/planet-hunters-tess Search for exoplanet transit signals in data from the TESS (Transiting Exoplanet Survey Satellite) space telescope. TESS produces light curves for millions of stars; human review catches signals that automated pipelines miss.

Globe at Night — globeatnight.org A citizen science programme measuring light pollution by comparing what you can see with star maps of increasing limiting magnitude. Contributes to a global database of sky brightness.

Variable Star Observations — American Association of Variable Star Observers (aavso.org). Variable stars — stars that change in brightness — are observed systematically by amateur astronomers worldwide. AAVSO coordinates this global network and archives millions of observations. Many variable stars require regular monitoring that professional observatories cannot provide.

Online Resources

NASA Astronomy Picture of the Day (APOD) — apod.nasa.gov Every day, a different astronomical image with an explanation written by a professional astronomer. Read it daily. After a year, the cumulative effect on your vocabulary and understanding is substantial.

ESA/NASA Hubble Site — hubblesite.org Full-resolution Hubble Space Telescope images with detailed captions explaining the science. The image library is extraordinary.

NASA’s James Webb Space Telescope Gallery — webbtelescope.org The most powerful space telescope ever built, launched December 2021. The images of distant galaxies, stellar nurseries, and exoplanet atmospheres are transforming multiple areas of astronomy. The gallery is free and updated regularly.

arXiv Astrophysics — arxiv.org/archive/astro-ph Where professional astronomers publish their research before it appears in journals. Divided into subcategories: astro-ph.SR (stellar), astro-ph.GA (galactic), astro-ph.EP (Earth and planetary), astro-ph.CO (cosmology), astro-ph.HE (high-energy). The abstracts are usually readable without a physics background; the full papers vary considerably.

NASA/IPAC Extragalactic Database (NED) — ned.ipac.caltech.edu The professional database for extragalactic objects — every galaxy, quasar, and active galactic nucleus with known measurements. When you want the actual data rather than an artist’s impression.

The Sloan Digital Sky Survey (SDSS) — sdss.org A comprehensive photometric and spectroscopic survey covering one-third of the sky. The data is public. You can download actual spectra of galaxies, stars, and quasars and analyse them yourself.

Apps

Stellarium — stellarium.org Free on all platforms. Real-time sky simulation, telescope control, planetarium projection. The best general-purpose sky simulation software.

SkySafari — The most capable telescope-control app. The paid version controls GoTo telescopes directly. The free version is an excellent sky guide.

Sky Map (Android) / Star Walk 2 (iOS and Android) Point your phone at the sky and see what you are looking at. Useful for quick identification; no substitute for learning the sky yourself.

ISS Detector — Tracks the International Space Station and other satellites. The ISS is visible to the naked eye as a bright moving dot, faster than an airplane, for several minutes during each pass.

Clear Outside — Weather forecasting specifically for astronomical observing: cloud cover, seeing (atmospheric stability), transparency (sky darkness). Allows you to plan observing sessions around the weather.

Courses and Formal Learning

Introduction to Astronomy — Coursera (Duke University) A structured twelve-week introduction covering all the major areas: the solar system, stars, galaxies, and cosmology. Free to audit. The problem sets require some arithmetic but no calculus.

Astronomy: Discovering the Universe — Coursera (University of Cape Town) Slightly more accessible than the Duke course. Good for someone who wants the conceptual framework without the quantitative depth.

MIT OpenCourseWare: 8.902 Astrophysics — ocw.mit.edu A graduate-level astrophysics course with lecture notes and problem sets, free online. Requires calculus and classical mechanics. The standard entry point for serious quantitative astrophysics.

Crash Course Astronomy — YouTube (Phil Plait) Forty-seven short videos covering all areas of astronomy from the solar system to cosmology. Well-produced, accurate, and genuinely enjoyable. Good as a survey before going deeper into any specific area.

Part V — My Own Astronomy Work

I want to be honest about what “practical working” means in my case, because it is different from most of what I have described above.

My interest in astronomy started as observational — watching the Moon and Jupiter through my first telescope, learning the constellations, trying to find the Andromeda Galaxy from the rooftop in Delhi. That phase lasted about two years and was genuinely valuable: it built the intuition for scale and structure that makes the physics of astronomy meaningful later.

Over time, my interest shifted from observation to the physics and mathematics of astronomical phenomena. The questions I find most compelling now are not “where is this object?” but “why does this object exist?” and “what does it tell us about the underlying physics?”

Exomoon research. My most active area of astronomical interest. No exomoon has been definitively confirmed — the best candidate is Kepler-1625b-i, reported in 2018 by Kipping et al. using Hubble Space Telescope data, but the detection remains contested. Kálmán et al. (2025) used CHEOPS and TESS data to search for exomoon signals around HD 95338b using injection-retrieval tests. The CHEOPS view of HD 95338b (arXiv:2507.15318) presents a refined transit analysis and exomoon search methodology. Winterhalder et al. (2025) have developed astrometric exomoon detection using VLTI/GRAVITY interferometry (arXiv:2509.15304) — an entirely different approach from transit photometry, probing the reflex motion of the planet as a moon orbits it.

The technical question I am most interested in is whether TESS transit timing variations (TTVs) can be used to statistically constrain the exomoon population of known planetary systems — not detecting individual moons but characterising the population. This would require working with the TESS FFI (Full Frame Image) data and implementing a TTV extraction pipeline. This is active work that I am planning to formalise.

Cosmological structure. The connection between the QGET framework (described in the research page) and observational cosmology — specifically the CMB as a potential probe of entanglement structure at the origin of spacetime — is something I am thinking about. The Planck CMB data (irsa.ipac.caltech.edu/Missions/planck.html) is public and I have been working with it.

A Note on How Astronomy Changed Everything

I want to end with something I have not said explicitly in any of the other pages on this site.

Astronomy was not just the thing that interested me in grade 6. It was the thing that set me on the way on which I am still walking. Not because of the stars themselves — though I still love the stars — but because of what looking seriously at the stars requires: the willingness to follow a question wherever it leads, including into mathematics you do not know, into physics you do not understand, into ways of thinking that are completely unfamiliar.

I would not have ended up working on gauge theory and quantum gravity if I had not started with a YouTube video about black holes during a lockdown. The path is not linear and it is not obvious, but it exists, and it runs from that first night of looking at Jupiter through binoculars to the current work on the Yang–Mills mass gap.

Astronomy is where I learned that the universe is not just interesting — it is structured. And that the structure is knowable. That has been the central fact of my intellectual life ever since.

If you are at the beginning of this path, start outside. Tonight if possible.

Last updated March 2026.