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Flowing sand, not water, on Mars

The dark streaks on Mars known as recurring slope lineae are likely the result of repeated avalanches of sand and dust, rather than seeping water, new research shows.

What monarch butterflies prefer

Will our survival strategy for monarchs work? Initiatives emphasize milkweed plantings along roadsides. New research shows egg-laying monarchs much prefer off-road farmlands.

Fern, contrail shadow, singing dunes

It was a beautiful day for natural phenomena in the sky, and on the ground.

It’s the 1st known interstellar asteroid

It swept nearest the sun in September, then sped away again, back to interstellar space. Astronomers named it `Oumuamua. It’s dark red, very elongated and unlike anything in our solar system.

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Today in science: Edwin Hubble and the expanding universe

Learn why the Hubble Space Telescope is named for this astronomer.

Where’s the moon? Waxing crescent

Many photos of Sunday evening’s extremely thin and lovely young moon. A few glimpsed it near Mercury and Saturn, too. Watch for the waxing crescent in the evenings ahead.

Help astrobiologist find extreme rocks

A scientist launches a hunt for earthly extraterrestrials. Help her find them!

Venezuela is losing its last glacier

Venezuela’s last glacier is about to disappear, making it the first country in modern history to lose all of its glaciers.

Jupiter’s independently pulsating auroras

The auroras over Earth’s north and south poles typically mirror each other. But X-ray observations show that Jupiter’s auroras pulsate on different timescales.

Video: Our living planet from space

“That’s the Earth, breathing every single day, changing with the seasons, responding to the sun, to the changing winds, ocean currents and temperatures.”

5 discoveries we owe to twins

Years of twin research have led to incredible insights into how our genes and the environment affect our health.

Almach is a quadruple star system

Almach looks like 1 star to the eye and like a colorful duo through a telescope. But today we know Almach as 4 stars.

Photos of this week’s spectacular dawn

Favorite photos from around the globe of Venus, Jupiter, Mars and the moon, which put on a show in the east at dawn this week. Thanks to all who submitted or posted at EarthSky Facebook.