Speedy Altair
A close neighbor that moves fast
Astronomers have developed several techniques to indirectly measure the vast distances between Earth and the stars and galaxies. In many
How do astronomers measure distances to stars and galaxies? Read More »
To begin with, Earth is rotating on its axis at the familiar rate of one revolution per day. For those
Of course, the nearest star to Earth is the one we see every day — our dear old Sun. At
The Milky Way’s disk spans at least 100,000 light-years and probably contains several hundred billion stars, which makes our home