In 1543, Copernicus tried to show the world that medieval beliefs of an enclosed, Earth-centered universe were wrong. Instead, he said, Earth revolves around the sun. His work set off what’s known today as the Copernican Revolution.
Breaking through the crystal spheres
Recently-discovered fossils shed new light on an enormous horned turtle that roamed South America 5 to 10 million years ago.
Graphic reconstruction of the giant turtle Stupendemys geographicus, that lived in Venezuela 8 million years ago. Image viaJaime Chirinos/ University of Zurich. https://www.media.uzh.ch/en/Press-Releases/2020/Giant-Turtle.html
The moon will cover Mars 5 times in 2020, but the occultation on February 18, 2020, was the only one accessible to viewers in much of North and Central America. Photos from the EarthSky Community here.
View at EarthSky Community Photos
. | Joel Weatherly
in Edmonton, Aberta, Canada wrote on February 18, 2020: "Mars was peeking out from behind the moon mere moments after this morning’s lunar occultation of Mars. I encountered a lot of atmospheric turbulence this morning so the view was a little warbly, but it was still a neat event to see." Thank you, Joel!
The Dog Star, Sirius, is easy to spot because it’s the sky’s brightest star. Procyon – the other Dog Star – is near its brighter brother on the sky’s dome.
Image via Yunji Kitahara