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Yellowstone’s Roosevelt Arch with planets
Located in Gardiner, Montana, the Roosevelt Arch is at the north entrance to Yellowstone National Park. The US Army at Fort Yellowstone oversaw its construction. Theodore Roosevelt laid down its cornerstone in 1903.
February 9, 2019
Moon, Mars, Uranus from February 9 to 11
As darkness falls on February 9, 10 and 11, let the crescent moon guide you to Mars. Then let Mars guide you to the very faint planet Uranus.
February 9, 2019
When will the Milky Way and Andromeda galaxies collide?
The Andromeda galaxy is the nearest large spiral to our Milky Way. Astronomers have suspected for some time it will eventually collide with our Milky Way. Now - thanks to the Gaia satellite - they know more.
February 8, 2019
Orion the Hunter
Tom Wildoner captured the beautiful constellation Orion shining in the night sky over Weatherly, Pennsylvania, on February 4, 2019.
February 8, 2019
Much of Earth’s surface ocean will shift in color by end of 21st century
A new MIT study shows how changing colors of Earth's oceans can be used to monitor climate change in the relatively near future.
February 7, 2019
Do animals dream?
Your dog or cat might look as if it's dreaming when its whiskers twitch and legs wiggle. But are animals really dreaming?
February 7, 2019
How old is Earth’s inner core?
A new study suggests Earth's inner core is only about 565 million years old - relatively young compared to the age of our 4.5-billion-year-old planet.
February 7, 2019
Weird winter water: Steaming lakes, thundersnow, slurpee waves
An atmospheric scientist explains why water can do some strange-looking things at very cold temperatures, and what's different about snowfalls on Mars.
February 6, 2019
Cool! Watch swirling storm on Jupiter
Watch a giant, spiraling storm in Jupiter’s southern hemisphere in this animation, made from images taken by the Juno spacecraft.
February 6, 2019
