The Hubble Space Telescope captured this beautiful image of Comet C/2012 S1 (ISON) on April 10. The comet is now closer to the sun than Jupiter's orbit.
We're now more than a day past the peak of the Lyrid meteor shower. Check out this cool image of meteors, star trails and a foreground lit by a bright moon.
The early mathematician Fibonacci introduced Arabic numerals to the West. He also discovered a number sequence that's in everything from daisies to databases.
First quarter moon - when the moon appears half illuminated - comes on April 18. Last night, the line between light and dark on the moon was very slightly curved.
SN 1006 is a supernova remnant, a cloud of star debris initiated by a colossal stellar explosion in the year 1006. The debris has been expanding outward that year.
Deborah Byrd (asteroid 3505 Byrd) helps edit EarthSky.org and is a frequent host of EarthSky videos. Deborah created the EarthSky radio series in 1991 and founded EarthSky.org in 1994. Prior to that, she had worked for the University of Texas McDonald Observatory since 1976, and created and produced their Star Date radio series. She has won a galaxy of awards from the broadcasting and science communities, including having an asteroid named in her honor in 1990, a Public Service Award from the National Science Board in 2003, and the Education Prize from the American Astronomical Society in 2020. A science communicator and educator since 1976, Byrd believes in science as a force for good in the world and a vital tool for the 21st century. "Being an EarthSky editor is like hosting a big global party for cool nature-lovers," she says.