Enjoying EarthSky? Subscribe.

272,983 subscribers and counting ...

Eddie Irizarry

If it’s not a UFO, what is it?

Most Unidentified Flying Objects aren’t unidentified at all. Here’s a list of natural and human-made objects in the sky that people frequently mistake for UFOs.

Cygnus spacecraft’s fiery re-entry

Scientists aboard an aircraft caught the impressive streak and final breakup of the Orbital ATK Cygnus supply ship, as it re-entered Earth’s atmosphere on June 22.

Astronomers find a baby planet

Planet K2-33b resides in a solar system in the process of being born. In human terms, if Earth were 45 years old, this planet would be just a few weeks old.

Earth has a new quasi-satellite

Asteroid 2016 HO3 is Earth’s nearby companion in space. It’s not a second moon, but it has an orbit so similar to ours that it’ll remain nearby for hundreds of years.

I saw a flash in the night sky. What is it?

We can’t always say for sure what you saw in the night sky. But it might have been a flare from an iridium satellite.

Comet visible in binoculars, nearly closest

Comet C/2013 X1 (PanSTARRS) isn’t visible to the eye, but binoculars can pick it up. Charts and other info that can help you spot the comet in the coming weeks!

Closest comet in 246 years via radar

Record-breakingly close flybys of two comets earlier this week. Radar images of one, the closest comet in 246 years. Will the other be visible to the eye?

Small asteroid detected 4 days after passing as close as satellites

On March 15, astronomers detected an asteroid that had passed closest to Earth on March 11, sweeping in at about the distance of our geostationary satellites.

Asteroid 2013 TX68 passed safely Monday

The asteroid – whose precise trajectory was unknown – passed Earth on March 7 at 13:42 UTC (8:42 ET) at some 10 times the moon’s distance.

Space rocks from Florida fireball found!

A rare find by meteorite hunters in Florida, from the daylight meteor that streaked across skies in the U.S. southeast in late January.