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Reliving Cassini’s final moments

“Cassini managed to survive for 91 seconds in this epic battle, before tipping over backward during the last 8 seconds and then finally losing radio contact with Earth.”

Astronomers confirm Earth has an asteroid buddy

It’s the best and most stable example to date of a near-Earth companion, or “quasi-satellite.” It’s a small asteroid called 2016 HO3. It travels along with Earth in orbit around the sun.

See it! Orionid meteors this weekend

This weekend’s Orionid meteor shower didn’t disappoint. EarthSky community photos, here.

Young moon, refracted by atmosphere

Wonderful timelapse from Mike Cohea showing the October 20 young moon – only 1.3% illuminated – setting over Newport, Rhode Island, being refracted by Earth’s atmosphere. 

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Young moon returns to evening sky

The moon is back in the evening sky, and will soon sweep past the planet Saturn.

Watch for Taurid fireballs, too

North and South Taurid meteor showers happen simultaneously in late October and November. They’re relatively minor showers, but produce a high percentage of fireballs, or bright meteors.

See it! Elusive Uranus at opposition

Uranus – most distant planet visible, barely, to the unaided eye – was opposite the sun this week. Photos from the EarthSky community here.

Star of the week: Deneb Kaitos

Look for Deneb Kaitos – brightest star in Cetus the Whale – highest in the sky around mid-evening.

Watch ISS spacewalk October 20

Friday’s is the last of 3 spacewalks by International Space Station astronauts this month.

Whales and dolphins live ‘human-like’ lives

They work together, talk to each other and use tools. A new study links the complexity of Cetacean culture and behavior to the size of their brains.

Traveling to Mars? Top 6 health challenges

NASA aims to have humans on Mars by the 2030s. The people making the long space journey will experience health risks they’ve never faced before.

More evidence for a Planet 9

No new large planet on the outskirts of our solar system has yet been discovered, although evidence is building, astronomers say. By the way, if Planet 9 does exist … it’s definitely not headed our way.

What are gravitational waves?

If you understand how a trampoline works, you’ll be able to understand what gravitational waves are.