World Oceans Day has been celebrated every year on June 8 since 1992. It's a day to raise awareness about how we're connected to the oceans - no matter where we live on Earth - and what we can do to protect ocean habitats.
If the moon orbited Earth on the same plane that Earth circles the sun, then we'd have a total lunar eclipse at each full moon, and a total solar eclipse at each new moon. But that doesn't happen because the lunar orbit is inclined to Earth's orbit by about 5 degrees.
A podcast featuring Harvard theoretical physicist Avi Loeb, on the subject of whether 'Oumuamua - the strange object that swept through our solar system in 2017 - is an artifact of an alien intelligence.
The first of 2 spring supermoons in 2021 took place on April 26 or 27 (depending on your location on Earth). We received many wonderful submissions from you, our readers. Here's a gallery of some favorites. Thanks to all who submitted!