Stars and Galaxies
Galaxies contain billions of stars. Do galaxies collide? Do the stars within them collide?
Sunspots
The Sun is a huge sphere of gas. The visible layer of the Sun, which we view as the surface,
The Milky Way
Stretching across the dark night sky, not easily visible when the Moon is in the sky, is a faint irregular
Dark Energy
One of the most stupendous discoveries in astronomy came with the recent application of supernovae — the explosions of massive
Dark Matter
All of the stars, galaxies, and nebulae seen by telescopes make up only four percent of the contents of the
The Whole Universe
Cosmology deals with one of mankind’s earliest questions: what is the nature of the world? Ancient civilizations believed that Earth
What do scientists mean when they say space is curved?
Space is indeed curved — in four dimensions. Many people think the fourth dimension is simply time, and for some
What do scientists mean when they say space is curved? Read More »