The Expansion of the Universe, Dark Energy, and God
The structure of the universe, with billions of galaxies, has been figured out only in the last 100 years. In the US, Edwin Hubble in 1929 (the same name as in the Hubble Telescope) measured the speed of galaxies and found that all the galaxies were moving apart from each other — the universe was … More “The Expansion of the Universe, Dark Energy, and God”
Black hole surprises
Figure 1. An artist’s drawing of a black hole named Cygnus X-1. It formed when a large star caved in. This black hole pulls matter from a blue star beside it. Credits: NASA/CXC/M.Weiss
What are black holes?Black holes are formed when a star dies. But it must be a heavy star, 5-10 times heavier than … More “Black hole surprises”