How Do Astronomers Measure Distances in Space? The Cosmic Distance Ladder Explained
How can anyone know that a star is 400 light-years away when nobody has ever been there? In the Crash Course Astronomy episode above, Phil[…]
Read moreTag: crash course
Neutron Stars Explained: Pulsars, Magnetars and the Densest Stars in the Universe
Neutron stars are some of the strangest objects in the universe. They pack more mass than our Sun into a ball roughly the size of[…]
Read moreWhat Is Astronomy? A Beginner’s Introduction to the Science of the Sky
Welcome to astronomy, one of the oldest sciences and still one of the most exciting. In the first episode of Crash Course Astronomy, above, Phil[…]
Read more