Ask Astro | Page 4 of 21 | Astronomy.com

Credit: NASA/JPL-Caltech.

Exotic Objects, Galaxies

How does a black hole get to the center of a galaxy, and does the galaxy revolve around it?

Albireo

Why are there no green stars?

Active Region 13055 on the Sun

Solar System, Stars

What causes sunspots?

Mars InSight solar panel covered with dust

Robotic Spaceflight

Why doesn’t NASA build a mechanism to clean the solar panels on its Mars rovers?

Antennas of the Very Large Array

Can astronomers do their work during the day?

Where is the center of the universe?

open and globular star clusters

Galaxies, Stars

Why are open clusters and globular clusters found in different places?

What happens at the center of a black hole?

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?