Astronomy Questions & Answers

What’s a black hole? What’s inside a black hole? What’s the difference between a reflecting and refracting telescope? This is the place to come for answers to almost all the astronomy questions you can think of — and many you haven’t. Find answers to your equipment and hobby questions, as well as astronomy facts about the other planets in the solar system, stars, and galaxies.

Is Andromeda Galaxy headed for a clash with the Milky Way? What’s the faintest thing you can see with a ground-based telescope? From stargazing advice to stellar science, browse this Astronomy Q&A category, browse astronomy questions by topic, or email us with your own question at to deepen your knowledge of astronomy as a hobby and a science.

High-Definition Space Telescope (HDST)

Kavli Foundation Q&A: Searching for Alien Life with a “Super-Hubble” Space Telescope

Watch a Q&A with two astronomers on the promise of Hubble's successor telescope, courtesy of The Kavli Foundation. Scientists have unveiled a bold proposal for a giant new space-based telescope that would be far more powerful than today's observatories. Called the High Definition Space Telescope (HDST), the instrument is essentially a supersized Hubble Space Telescope,…

Fermi visualization of Milky Way bubbles

Q&A: Understanding the Fermi Bubbles

Sky & Telescope features a Q&A between The Kavli Foundation and three astrophysicists who discovered two enormous and unexpected structures radiating from the center of our galaxy. They discuss what these mysterious bubbles can tell us about the history of the Milky Way and how they could help in the search for dark matter.