Sagittarius the Archer
In northern hemisphere summer, the ancient zodiac constellation Sagittarius stands low on the southern horizon. It's a special constellation, for when you see Sagittarius, you're looking into the heart of the Milky Way.
ABC of Astronomy – A Is for Astronomy
In the ABC of astronomy, astronomy itself is the first and most important item. What is astronomy and how does it differ from astrology? What are the main specialist areas in astronomy and how do they contribute to the overall picture?
Rhea - Saturn's Moon Facts for Kids
Even being Saturn's second biggest moon doesn't make Rhea very big. You could fit three Rheas across the USA and still have room left over. It whizzes around Saturn in four and a half days, making for very short months. It's so cold there that ice is literally as hard as rock.
We no longer see the heavens as perfect and the stars as eternal and unchanging. Even the Universe had a beginning, and everything that we observe changes and evolves. Many of these changes involve cosmic collisions.
If stars aren't white, why isn't the night sky more colorful? If it's 93 million miles to the Sun, how many times farther away is the next nearest star? Will the Sun become a black hole and suck us in? Here's a short explanation of some common misconceptions about the stars.
Pluto Is a Dwarf Planet
Some people are still upset that Pluto isn't considered a planet any more. But was it ever really a planet?
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