Why do we need a leap year? And happy February 29!

Every 4 years is a leap year. So 2024 has a leap day, February 29. But why? Julius Caesar presented a solar calendar to keep the seasons in line.

How astronauts to Mars can manage stress on the long journey

Astronauts headed to Mars will live and work in confinement for more than two years. Here are ways to manage these stressful conditions.

Underground nuclear tests now 99% detectable

New science is now able to detect 99% of underground nuclear tests, which will help keep tests from being conducted in secret.

Why is the 2024 Lunar New Year so late? Blame the moon

The reason the 2024 Lunar New Year falls so late is the date of new moon and how it aligns with spring in the Chinese calendar.

Lunar New Year 2024: The Year of the Dragon

The Lunar New Year falls on February 10, 2024 (in Asia). It coincides with the date of new moon and signals the start of the Year of the Dragon.

The April 8 eclipse is part of Saros 139. What does that mean?

Enjoy the April 8 eclipse as you witness the 30th of 71 member eclipses in the illustrious procession known as Saros 139. Learn more here.

NASA Jet Propulsion Laboratory to cut 8% of workforce this week

NASA's Jet Propulsion Laboratory - for decades a leader in robotic exploration of the planets in our solar system - will cut 8% of its workforce this week.

Groundhog Day is February 2. Phil says early spring!

It was a chilly 39 degrees F (3.8 C) this morning in Punxsutawney, PA, when Phil predicted an early spring. Happy Groundhog Day!

SKA telescope 1st light! Milky Way core and more

A prototype antenna for the new SKA telescope, to be located in South Africa and Australia, just made a big step forward with a 1st-light image!

Can beavers revitalize California’s mountains and meadows?

Officials in California are relocating beavers (Castor canadensis) to help improve the state's mountain environment and waterways.