Why isn't there an endless variety of planets in the universe? An astrophysicist explains why planets only come in two flavors.
Many people are still upset that Pluto was demoted from being a planet. But definitions of various celestial objects are fairly fluid. So whether it is an asteroid or moon or planet is up for debate.
It is always exciting to discover new planets beyond our Solar System. Now a planetary astrophysicist is using a star's chemistry to predict which ones are likely to host giant planets.
Are there stars other than the Sun that might explode soon close to us? Yes, there are! As long as by 'soon' we mean within a million years.
We are in the Milky Way. If you travelled on an extremely fast spaceship for more than two million years, you would reach our neighbour, the Andromeda galaxy. All other galaxies are even further away.
How exactly do the stars twinkle in the night sky? As it turns out, the answer is full of hot air... and cold air.
Understanding how the billions of stars in our galaxy formed and evolved is the subject of a huge galactic archaeology project.
Sonification is a technique for converting data into sound. It could transform the study of distant worlds.