Astronomical Firsts
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Energy: Tools of the Trade
When we look at a rainbow, we see sunlight spread out into red, orange, yellow, green, blue, and violet. But
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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
Age of the Universe
Astronomers use several different methods to date the universe. In recent years, results from these differing methods have been coming
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The Whole Universe
Cosmology deals with one of mankind’s earliest questions: what is the nature of the world? Ancient civilizations believed that Earth
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Galaxies Fade
On the human time scale, the Milky Way galaxy is eternal. The starry Milky Way shined down on the first
The Local Group
These galaxies move through space as a single unit, bound together by their mutual gravitational pull. The number of galaxies