Category: Stars and galaxies

We have likened the star-gas-star cycle in our Milky Way to the ecosystem that s We have likened the star-gas-star cycle in our Milky Way to the ecosystem that sustains life on Earth. Here on our planet, water molecules cycle from the sea to the sky to the ground and back to the sea. Our…

The evidence for stellar-sized black holes and supermassive black holes at the c The evidence for stellar-sized black holes and supermassive black holes at the center of galaxies, including our own Milky Way Galaxy, is strong. However, it is very difficult to prove absolutely that they exist because black holes themselves emit no light. We…