If it exists, the 9th planet has 10 times the mass of Earth - orbits 20 times farther from the sun than Neptune - and takes 20,000 years to orbit the sun once.
As seen from North America - and westernmost Europe and Africa - moon swept in front of bright star Aldebaran last night. Photos from the EarthSky community here.
The supernova was as bright as 570 billion of our suns and some 20 times as luminous as the entire output of the 100 billion stars of our Milky Way galaxy.
A foggy lift-off - successful deployment of Jason 3 satellite - and spectacular crash at attempted sea landing for SpaceX yesterday. Spectacular video of crash, here.
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.