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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."
October 23, 2017
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.
October 22, 2017
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.
October 20, 2017
Watch ISS spacewalk October 20
Friday's is the last of 3 spacewalks by International Space Station astronauts this month.
October 19, 2017
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.
October 18, 2017
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.
October 17, 2017
Gravitational waves: What are they?
If you understand how a trampoline works, you'll be able to understand what gravitational waves are.
October 17, 2017
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."
October 16, 2017
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.
October 16, 2017
Intense storms batter Saturn moon Titan
“I would have thought these would be once-a-millennium events, if even that,” said a researcher. Instead, the storms on Titan happen about once a Saturn-year, creating massive floods in an otherwise-desert terrain.
October 14, 2017
