Two radar images of double asteroid 1999 KW4. It's a large space rock just under a mile wide (about 1.5 km), with smaller companion moon (the bright speck). The little moon can be seen to move from one side of the asteroid to the other, as it orbits. Images via Arecibo Observatory in Puerto Rico.
Professional and amateur astronomers will be observing asteroid 1999 KW4 - oddly shaped, about a mile wide, with a companion moon - around its closest approach on May 25. Charts here for amateur observers across the globe. Read more.
Check EarthSky Community Photos for many beautiful shots of last night's full moon. Thank you to all who contributed! Submit a photo to our community page here.
One has a thick poisonous atmosphere, one has hardly any atmosphere at all, and one is just right for life to flourish. But it wasn’t always that way. The atmospheres of our 2 neighbors can teach us a lot about past and future scenarios for our own planet. Read more.
The moon is past full now, so it's rising when the sky is fully dark. Tonight's moon rises about an hour after sunset. Wait, and Jupiter will come over your eastern horizon. Also, watch for Antares, fainter than Jupiter and the moon, but very twinkly and reddish in color. Read more.
View at EarthSky Community Photos. | Swami Krishnananda in India created this composite image and wrote: "Yesterday was a great celebration in the Buddhist world: the full moon night on which Lord Buddha took birth, and also attained his illumination as well as his departure from this world. This photo of the moon was taken by me using a blue filter, with Nikon P-1000, and the image of Buddha was superimposed on it."
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