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EarthSky

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.

Ancient cold front in Perseus

Galactic cold fronts aren’t like the cold fronts we experience on Earth. They’re caused by galaxy clusters colliding into one another.

NOAA issues 2018-19 Winter Weather Outlook for US

About 3/4 of the United States is more likely to be warmer-than-average than colder-than-average this winter, according the NOAA report, and western drought is likely to persist or worsen.

Top 5 things to know about InSight Mars

InSight is a Mars lander – not a rover – designed to study a whole world from just one spot. It’s due to arrive at Mars in November. Here are 5 highlights of the mission.

Baby stars blow bubbles in Cat’s Paw Nebula

In the star-forming Cat’s Paw Nebula, baby stars heat up the gas surrounding them. The gas then expands to form bubbles in the nebula.

This planetary nebula has 2 ultra-close stars at its heart

A planetary nebula isn’t related to planets. It’s an old star, sloughing off its outer layers. Now astronomers have spied 2 ultra-close stars at a planetary nebula’s heart. The pair orbits in only 3 hours!