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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 for Taurid fireballs

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.

Watch ISS spacewalk October 20

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

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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.

Gravitational waves, and more, from merging neutron stars

On Monday, LIGO and Virgo announced the 1st detection of gravitational waves produced by colliding neutron stars, and 1st observed in both gravitational waves and light. “It ushers in a new era in astronomy.”

The UK had a red sun Monday

Social media was buzzing on Monday with photos and accounts of the red sun over the UK. British weather forecasters said it was dust from the Sahara, raised via Hurricane Ophelia.

Egg-shaped Haumea has a ring

Dwarf planet Haumea – which orbits our sun in Pluto’s realm of the solar system – has become the first trans-Neptunian object known to be encircled by a ring.

Look for Orionid meteors this month

Details on the annual Orionid meteor shower. How and when to watch. In 2017, the peak morning is probably October 21. But start watching now, before dawn!

Creatures raft across Pacific, thanks to tsunami

Hundreds of species hitched a ride on debris from the 2011 Japanese tsunami for a 4,400-mile journey across the Pacific Ocean.