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See it! Last night’s moon and Venus

Photos from EarthSky friends around the world of Sunday evening’s spectacular moon and planet Venus, and Saturday’s moon and Mercury. Thanks to all who submitted or posted to our Facebook page! Miss then? Try again Monday.

Astronomers find ‘ghost dunes’ on Mars

Robot orbiters circling Mars have acquired images of ghost dunes. They’re pits where, scientists believe, tall crescent-shaped sand dunes once existed on this red desert world.

All you need to know: Delta Aquariid meteors in 2018

With the long-running Delta Aquariid meteor shower already in progress, and the moon in a waxing crescent phase – and gone from the sky after midnight – we’re beginning to receive meteor photos.

Innovative new instrument to seek habitable worlds

A new infrared instrument on a telescope in Hawaii will let astronomers find more exoplanets orbiting red dwarf stars. The discoveries may include rocky worlds that are potentially habitable.

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Ghostly neutrino caught in South Pole ice ushers in a new astronomy

Last week, scientists announced the 1st known source for ghostly, high-energy neutrinos. The source is a blazar, a billion-solar-mass black hole 3.7 billion light-years away. The discovery establishes a new way to study the universe.

5 things we know – and 5 we don’t – about ‘Oumuamua

Mysterious ‘Oumuamua is the 1st confirmed interstellar object to pass through our solar system.

Mars! Mars! Mars!

The best time to see Mars since 2003 is now! Watch for Mars as the extremely bright red “star,” ascending in the east by mid-evening, crossing the sky for the rest of the night. Photos from the EarthSky community here.

Asteroid 2017 YE5 turns out to be double

Asteroid 2017 YE5 swept by Earth in late June. Turns out, it’s a double asteroid, with both bodies almost identical in size and not touching – only the 4th such object ever detected.

How the moon’s orbit makes supermoons

An explanation of why extra-close perigees and extra-far apogees happen at new and full moons.

Scared yet? 2018 has 2 Friday 13ths

This Friday the 13th comes exactly 13 weeks after 2018’s first Friday the 13th, in April. The whats, whens and whys of Friday the 13th.

2018’s closest new supermoon on July 13

The closest new moon of 2018 – a supermoon – comes on July 13. You won’t see it, but Earth’s oceans will feel it. Then, 2 weeks later, we have the year’s farthest full moon.

See it! Crepuscular rays

Those beams of light shooting out from the horizon or down from the clouds are called crepuscular rays, or sunrays. Beautiful, mysterious and very noticeable.

From Pluto, Earth to transit sun on July 12

Earth transits seen from Pluto are rare. The last one happened in 1931, a year after Clyde Tombaugh discovered Pluto. It won’t happen again for 161 years.