Asteroid Florence found to have 2 moons

3122 Florence passed yesterday, biggest near-Earth object to pass so close in a century. Radar revealed 2 orbiting moons! Plus a chart that'll help you spot the asteroid.

Alien seekers report 15 more fast radio bursts from FRB 121102

Breakthrough Listen – an initiative to find signs of intelligent life in the universe – used the Green Bank Telescope to observe the bursts from the mysterious distant object known as FRB 121102.

First hints of water on TRAPPIST-1 planets

A new Hubble study suggests possible substantial water on the outer Earth-sized planets orbiting nearby dwarf star TRAPPIST-1.

Exploring the triggers of cosmic disaster

A new study uses data from ESA's Gaia satellite to give the first systematic estimate of how often passing stars nudge comets from the Oort Cloud and send them plunging toward the inner solar system.

Mystery of high-energy cosmic rays

Hold out your hand for 10 seconds. A dozen electrons and muons just zipped through your palm. These cosmic rays, scientists believe, come from violent explosions in deep space.

Space station transits sun during eclipse

There was only one part of Earth where you could catch the International Space Station crossing the sun's face during the August 21 solar eclipse. These guys saw it, and created this video.

More space views of the eclipse

Primeval and technological wonder meet. A collection of the best images we saw, from a variety of space-based observing platforms.

How ISS astronauts saw the eclipse

The International Space Station passed 3 times on Monday through the moon's penumbral shadow. Images of the moon's shadow on Earth, seen from space, acquired by ISS astronauts.

The hunt for asteroids

New short video from NASA about the hunt for potentially hazardous asteroids and comets, and ways to defend Earth against them.

Cassini prepares for last look at Titan

Even as the long-lived Cassini spacecraft gears up for its last moments at Saturn, it's preparing for a final long-distance look at Titan, Saturn's large moon, on September 11.

Matching Donation Campaign

Exciting news! EarthSky received a $50,000 gift, with a request that it be used to collect matching funds. Please help us meet this match by donating to EarthSky today!

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