This comprehensive list profiles 48 notable 19th century astronomers, outlining each figure’s lifespan, nationality, and primary role or discovery. Ideal for students, historians, and astronomy enthusiasts seeking a concise, authoritative reference to the era’s leading observers and scientists.
This post breaks down the 6 differences between comets and asteroids — from composition and orbits to appearance, activity, and origin. Clear comparisons and links to deeper articles make it easy to learn how these small bodies differ and why it matters.
Explore 15 significant Galaxies Discovered by the Hubble, each entry listing discovery year, measured redshift, and the notable reason it made headlines. From Hubble Deep Field treasures to unexpected high-redshift galaxies and gravitationally lensed wonders, this illustrated list explains observational context and why each discovery reshaped our view of the cosmos.
Explore a curated list of the 25 Coolest Stars — from nearby brown dwarfs and L/T/Y-class objects to ultracool M-dwarfs. Each entry lists temperature (K), spectral type, and distance (ly), letting amateur astronomers and science readers compare the coldest stellar objects and understand why they rank among the coldest known.
A complete compilation of 59 merging black holes detected to date, listing each event’s detection date (UTC), component masses (M☉), and distance (Mpc). Explore the dataset to compare mass ranges, distances, and the landmark gravitational-wave discoveries from LIGO/Virgo/KAGRA.
This comprehensive hub explains 10 different types of eclipses — from total and annular solar eclipses to penumbral lunar and grazing eclipses. For each type we describe how it forms, what it looks like, viewing safety tips, and link to deeper posts for detailed guides and event predictions.
This comprehensive list compiles 99 known Periodic Comets, providing each comet’s designation, orbital period in years, and the next predicted perihelion date. Use this resource to track appearances, plan observations, and learn the schedules and orbital characteristics of famous and lesser-known periodic visitors to the inner solar system.
Explore the 10 Smallest Objects in the Solar System, a compact guide to the tiniest moons, asteroids, comet nuclei, and minor bodies. This hub post summarizes each object’s size, location, and significance, and links to in-depth articles for further reading.
Explore 10 cosmic events that typically recur on roughly 100-year timescales — from long-returning comets and century meteor outbursts to rare solar and planetary cycles. This hub post summarizes each event and links to detailed guides so you can learn what they are, when they happen, and how to observe them.
Explore eight major types of exoplanet atmospheres in this hub post, from hydrogen-rich gas giants to thin rocky-world envelopes. Each type includes key traits, observational signatures, and linked deep-dive articles so you can learn what they reveal about formation and habitability.
