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!

The EarthSky-recommended tide almanacs listed here are based on astronomical influences on the tides. They'll help you in finding the next high and low tides.

When sunlight filters through trees, you may get a corona effect where the rays from the light sources take on the colors of the rainbow.

Data from ESA’s Gaia star-mapping satellite have revealed tantalizing evidence that the famous V-shaped Hyades - nearest star cluster to our sun - is being disrupted. The culprit may be a suspected population of dark matter sub-halos. Wow!

This spectacular image features spiral galaxy Messier 106 and its diminutive neighbors, as well as a dense field of background galaxies and foreground stars.

A strong tropical depression picking up moisture from the warm ocean caused widespread flooding in the Hawaiian islands.

UK scientists and meteor experts have recovered pieces of a rare meteorite, just days after it entered Earth's atmosphere and streaked across the sky. Researchers are ecstatic. "Normally we have to send spacecraft to collect bits of other worlds, but this time one has fallen right into our laps!" one said.

Jet contrail shadows may appear to be cast by a low-altitude bright light shining upwards. In fact, this shadow is normally cast on clouds below the jet and its contrail.

We share your best photos of winter 2021!