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A case against killing spiders

An entomologist explains why it’s a good idea to be nice to the spiders you encounter and consider a live-and-let-live policy.

Top tips for poison ivy

Summer is a great time to frolic in the woods, but look out for poison ivy, oak, and sumac! Top tips for summer itch-prevention.

Does Mars have a North Star?

Will future Mars explorers have a North Star to guide them?

A tiny helicopter for Mars 2020

“After the Wright Brothers proved 117 years ago that powered, sustained, and controlled flight was possible here on Earth, another group of American pioneers may prove the same can be done on another world.”

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Mars brighter in 2018 than since 2003

Mars is getting bright! But it’s still up between midnight and dawn. Between now and July, the red planet will shift over into the evening sky … and then the drama will begin!

Meet our solar system’s 1st-known permanent immigrant

Mysterious asteroid 2015 BZ509 – currently nestling in Jupiter’s orbit – became less mysterious once astronomers realized it’s an immigrant, captured from another solar system.

Astronomers spot exiled asteroid in outer reaches of solar system

This object was likely born in the Asteroid Belt between Mars and Jupiter, then flung billions of miles to the Kuiper Belt on the edge of the solar system.

Situation at Kilauea Volcano ‘steadily worsening’

A large explosion happened Friday night into Saturday at Hawaii’s Kilauea Volcano. The 1st serious injury is reported. USGS warns of the release of toxic gases in a plume called a laze, which happens when molten lava hits sea water. Latest images and videos here.

TESS planet-hunter snaps 1st test image, swings by moon

How many unseen worlds orbit these stars? The TESS planet-hunter is designed to find nearby exoplanets, between 30 and 300 light-years away.

Scientists measure rise in ozone-destroying chemical

Report on CFC-11 – an illegal chemical responsible for ozone-depletion in Earth’s atmosphere – now apparently on an upswing again. Meanwhile, new direct evidence the ban on CFCs is working and the ozone hole is recovering.

Shelf cloud over New York

A squall line of severe thunderstorms swept over New York City and the surrounding area last Tuesday, creating dramatic skies.

See it! Young moon and Venus

The returning moon and brightest planet were near each other in the sky the last 2 evenings. Don’t miss these gorgeous photos from the EarthSky community.

You can’t walk on these cloud streets

Cloud streets are long rows of cumulus clouds oriented parallel to the direction of the wind. Check out these cool images!

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