Ask Astro

Cosmology

Are the percentages of dark matter and dark energy stable?

Exotic Objects, Galaxies

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

Stars

Why are there no green stars?

Solar System, Stars

What causes sunspots?

Robotic Spaceflight

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

Science

Can astronomers do their work during the day?

Cosmology

Where is the center of the universe?

Galaxies, Stars

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

Exotic Objects

What happens at the center of a black hole?

Science

How do radio telescopes work?

Robotic Spaceflight, Solar System

What time is it on Mars?

Cosmology

Is gravity instantaneous?