Ask Astro | Astronomy.com

Illustration of how a radio telescope works

How do radio telescopes work?

A composite of two different times, as seen by Curiosity on Mars

Robotic Spaceflight, Solar System

What time is it on Mars?

Illustration of a kilonova

Is gravity instantaneous?

The Large Hadron Collider at CERN

Does E = mc^2 hold true for dark matter and dark energy?

Why is the night sky dark?

JWST image of the Pillars of Creation

If protostars aren’t yet generating light through fusion, how can JWST see them?

A frame from the Illustris Simulation

What is the cosmic web made of?

Artist concept of Cassini crashing into Saturn

Alien Life, Solar System

Why was Cassini crashed into Saturn to prevent contamination if Huygens intentionally landed on Titan?

How mass warps space-time

Do black holes have bottoms?

The Moon with South Pole–Aitken Basin circled

What would happen to Earth if a large asteroid hit the Moon?

Images of SMBHs in M87 and the Milky Way

What are the blobs in the EHT image of the Milky Way’s supermassive black hole?

How do professional observatories deal with dew on mirrors and lenses?