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EarthSky

Gaia spots enormous ghost galaxy on Milky Way’s outskirts

Gaia satellite data revealed the galaxy, which has avoided detection until now, thanks to its extremely low density and hiding place behind the shroud of the Milky Way’s disk.

Here are 6 reasons to study asteroids and comets

First, asteroids can serve as pit stops – and provide resources – for future space exploration. Second, some asteroids or comets may be hazards to Earth.

Synchronized telescopes put limits on mystery bursts

A technological tango between 2 telescopes in the Australian outback has added an important piece to the puzzle of fast radio bursts.

Astronomers find largest-yet galaxy proto-supercluster

Astronomers have identified a gigantic proto-supercluster of galaxies forming in the early universe, just 2.3 billion years after the Big Bang.

Galaxy-scale fountain seen in full glory

At the core of the giant elliptical galaxy Abell 2597, a supermassive black hole is powering the cosmic equivalent of a gargantuan, ongoing fountain.

Why leaves change color in fall

The bright colors are wonderful to behold. But do they have some hidden purpose?

Lucy mission to Jupiter’s Trojans gets the nod from NASA

There are perhaps as many Trojan asteroids orbiting 60 degrees ahead of and behind Jupiter as in the asteroid belt between Jupiter and Mars. Now NASA has given a go-ahead for the 1st mission to Jupiter’s Trojans.

5 weird ocean phenomena

Strange things happen in the ocean as a result of weather and currents. These 5 events are just a few of them.

Cassiopeia to Andromeda galaxy

One half of the W of Cassiopeia is more deeply notched than the other half. This deeper V is your “arrow” in the sky, pointing to the Andromeda galaxy.

Zoom in on the Ghost Nebula

Nebula IC 63 – in the direction of our constellation Cassiopeia – is slowly dissipating under the influence of ionizing ultraviolet radiation from a hot, luminous variable star known as Gamma Cas.