Ask Astro

Solar System

How often does Earth transit the Sun for an observer on Mars?

Cosmology, Galaxies

How can galaxies merge if the everything in the universe is moving apart?

Solar System

Why does the Moon turn red during a lunar eclipse?

Solar System

Can Mars’ moons cause solar eclipses?

Solar System

Could you see Mars’ moons from the surface with just your eyes?

Space Exploration

Why does the travel time from Earth to Mars vary?

Science, Solar System

How did ancient astronomers predict solar eclipses?

Science, Solar System

What happens if Earth stops rotating?

Science, Solar System, Stars

How can the Sun contain so many elements without its heat destroying them?

Observing

Who made the present-day constellations and why do they look the way they do?

Exoplanets, Science, Solar System

Why don’t planets fall into the stars they orbit?

Galaxies, Science, Stars

Do all stars exist in galaxies?