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 concise guide to 10 Time Travel Theories in Physics that breaks down major proposals—from wormholes and closed timelike curves to quantum retrocausality—explaining the science, paradoxes, and current research. This hub links to in-depth articles for each theory so curious readers and students can explore the evidence, math, and philosophical implications behind every idea.
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 definitive list of 17 Ukrainian Astronauts, detailing birthplace, nationality at time of flight, and mission years. This comprehensive reference profiles each Ukrainian who traveled to space, with mission highlights and historical context — perfect for enthusiasts, researchers, and educators.
Explore the definitive List of Czech Astronauts, detailing each astronaut’s missions, flight dates, and agency affiliations. This compact reference highlights the historic flight of Vladimír Remek (Soyuz 28) and provides authoritative mission data for researchers, students, and space enthusiasts.
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.
This comprehensive list highlights 8 Planetariums in Iowa, providing city, address, and admission prices to help you plan educational outings, family trips, or date-night stargazing. Use this guide to compare locations, check hours and accessibility, and discover special shows, school programs, and membership options so you can choose the best planetarium for your next celestial adventure.
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.
