Objects in space aren't the same size, but why not? A scientist used a theory he formulated earlier - to explain patterns in nature on Earth - to suggest a reason.
You can capture the International Space Station as a long streak crossing your sky, or you can catch it close-up. Dan Wyman in California captured both.
Monday's full moonrise at MMT, part of Whipple Observatory - located on Mount Hopkins, Arizona, - 34 miles (55 km) south of Tucson in the Santa Rita Mountains.
It's been 3 years since the dazzling fireball over Chelyabinsk, Russia, and its aftereffects in 6 Russian cities. Yet scientists still don't know its origin.
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.