EarthSky Tonight—Algol, a famous variable star, dimmest tonight
Algol is what astronomers call an eclipsing binary star. In other words, the single point of light that we see as Algol is really two stars.
EarthSky Tonight—Nov 6, A famous variable star in the constellation Cepheus
The brightness of a Cepheid variable star changes because the star is actually expanding and contracting in size.
Earthsky Tonight—July 10, Look toward the center of the Milky Way galaxy
Today’s chart shows that the starlit trail of the Milky Way seems to bulge just before it reaches the southern horizon. This bulge marks the approximate location of the Milky…
Earthsky Tonight—July ll, When is the next total solar eclipse in the U.S.?
A total eclipse of the sun takes place today, but not in the United States. To see it – onhttp://codex.wordpress.org/Excerpte of nature’s grandest spectacles – you must be located along…