EarthSky News - Feb 21 - Help Astronomers Look for Planet 9

February 21 Help Astronomers Look for Planet 9 by:

Help astronomers look for Planet 9 There might be an unknown 9th planet that orbits far from Earth, on the outer fringes of our solar system. You can help astronomers find it, if it exists. Brightest, farthest pulsar found In one second, this distant pulsar – the spinning remains of a once-massive star – emits the same amount of energy as that released by our sun in 3.5 years. Tonight … Find blue-white Rigel at Orion's foot If Rigel were as close as our sun, it would outshine the sun by 40,000 times. What causes the aurora borealis? Don't miss the glorious pics at the bottom of this post!

Order your EarthSky Planisphere today! A planisphere is virtually indispensable for beginning stargazers. Your support means the world to us.

Chicago from St. Joseph, Michigan The little building in the center of the sunset is in Chicago. Photo by Joshua Nowicki in St. Joseph, Michigan, 60 miles away.

Tonight … Find blue-white Rigel at Orion's foot Rigel's blue-white color tells you it's a mighty star. Submit your photo to EarthSky here!

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