Ancient impact that formed Earth's moon was likely a one-two punch -
Sep 24, 2021 1 min, 30 secs

The gigantic impact that created the moon was actually a one-two punch, a new study suggests.

Scientists think that the moon, our planet's only natural satellite, was born in violence, coalescing from the material blasted into space after a Mars-size body named Theia slammed into the proto-Earth more than 4.4 billion years ago?

"The standard model for the moon requires a very slow collision, relatively speaking, and it creates a moon that is composed mostly of the impacting planet, not the proto-Earth, which is a major problem since the moon has an isotopic chemistry almost identical to Earth," lead author Erik Asphaug, a professor at the University of Arizona's Lunar and Planetary Laboratory (LPL), said in a statement.

"The double impact mixes things up much more than a single event, which could explain the isotopic similarity of Earth and moon, and also how the second, slow, merging collision would have happened in the first place," Asphaug said.

Indeed, such bouncing smashups were probably about as common as accretionary mergers in the ancient inner solar system, the same research team reports in a second new study.

They found that Earth likely acted as a sort of shield for Venus, taking the brunt of hit-and-run first impacts.

"The prevailing idea has been that it doesn't really matter if planets collide and don't merge right away, because they are going to run into each other again at some point and merge then," Alexandre Emsenhuber, the lead author of the second study, said in the same statement.

"You would think that Earth is made up more of material from the outer system because it is closer to the outer solar system than Venus," Asphaug said.

"But actually, with Earth in this vanguard role, it makes it actually more likely for Venus to accrete outer solar system material.".

1. Gaffe Milite Ignoto, via il responsabile dell'errore. E' un 'esperto' nominato dalla ministra Dadone
Oct 25, 2021 # breaking 12 secs
2. Tipster outs CPU-Z benchmark results for i5-12600K: beats the i9-11900K and nearly doubles the 5600X's multithreaded score -
Oct 24, 2021 # technology 25 secs
3. Greenhouse gas levels hit record; world struggles to curb damage - Reuters
Oct 25, 2021 # politics 1 min, 5 secs
4. 3 Zodiac Signs Who Will Have A Great Day On October 22, 2021 - YourTango
Oct 22, 2021 # entertainment 1 min, 36 secs
5. Trevor Noah Predicts Donald Trump Will Use His New Social Media Platform In 1 Wild Way - HuffPost
Oct 22, 2021 # politics 16 secs
6. Explosive star death witnessed by Hubble could help develop an early warning system - CNN
Oct 21, 2021 # science 1 min, 34 secs
7. Progress MS-17 to make 24 hour long relocation at space station - -
Oct 20, 2021 # science 1 min, 31 secs
8. Bethenny Frankel holds hands with her 11-year-old daughter Bryn Hoppy - Daily Mail
Oct 27, 2021 # entertainment 1 min, 36 secs
9. For 28 years, I kept my breast cancer a secret. Here's what changed my mind. - Yahoo News
Oct 23, 2021 # health 24 secs
10. Wave of Cyberattacks Hitting American Companies, Microsoft Warns
Oct 25, 2021 # breaking 1 min, 11 secs
11. One Step Closer: Orion Spacecraft Stacked on Top SLS Rocket for NASA’s Artemis I Mission - SciTechDaily
Oct 22, 2021 # science 1 min, 13 secs
12. Budget 2021: Ministers pledge £500m to support young families - BBC News
Oct 23, 2021 # politics 1 min, 41 secs
13. COVID-19: New, infectious strain of Delta variant detected in the US - New York Post
Oct 20, 2021 # health 34 secs
14. Dickson County woman gives birth to son before passing away from COVID-19 - WKRN News 2
Oct 22, 2021 # health 8 secs
15. Juan Williams: Trump is killing American democracy | TheHill
Oct 25, 2021 # breaking 1 min, 45 secs
16. Top oil exporter Saudi Arabia targets net zero emissions by 2060 - CNN
Oct 23, 2021 # politics 1 min, 11 secs


Get monthly updates and free resources.


© Copyright 2021 365NEWSX - All RIGHTS RESERVED