EarthSky | What is stellar magnitude? Ancient to modern
Brightest stars to the eye are 1st magnitude, and dimmest stars to the eye are 6th magnitude. How does stellar magnitude work in astronomy?
Source: earthsky.org
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EarthSky | Is Sirius the most luminous star?
Sirius is the brightest star in Earth's sky because of how close it is to us. It's so bright you might see glints of different colors radiating from it.
Source: earthsky.org
EarthSky | Zodiacal light: All you need to know
The zodiacal light is an eerie light extending up from the horizon. And the month of March is a good time to see it. How to see the zodiacal light, here.
Source: earthsky.org
EarthSky | What is earthshine?
Earthshine - the dim glow on the darkened portion of a crescent moon - is light from Earth cast on the night side of the moon.
Source: earthsky.org
Milky Way and Andromeda galaxies are already merging | Astronomy Essentials
Billions of years from now, Earth's night sky will change as the Andromeda galaxy rushes toward a merger with the Milky Way. But the merger has already started!
Source: earthsky.org