•   
  •   
  •   

Technology Early Earth Took a Heavy Beating After the Moon Was Formed

02:36  08 december  2017
02:36  08 december  2017 Source:   space.com

"Potentially hazardous" asteroid to fly by Earth

  NASA says 3200 Phaethon is third-largest "potentially hazardous" asteroid to pass by EarthA large flying object expected in December has caught NASA's attention, but it isn't Santa Claus' sleigh.

Early Earth was bombarded by material that plunged all the way to its core or splashed off, requiring the planet to take more hits to deposit some of the elements present in its mantle. Earth may have been bruised by the impact of more than one moon -size object early in its life.

The Earth 's moon formed about 100 million years after the birth of the solar system, scientists say. Moon Master: An Easy Quiz for Lunatics. For most of human history, the moon was largely a mystery. Early Earth Took a Heavy Beating After the Moon Was Formed .

Early Earth was bombarded by material that plunged all the way to its core or splashed off, requiring the planet to take more hits to deposit some of the elements present in its mantle. © Southwest Research Institute Early Earth was bombarded by material that plunged all the way to its core or splashed off, requiring the planet to take more hits to deposit some of the elements present in its mantle.

Earth may have been bruised by the impact of more than one moon-size object early in its life. 

New simulations suggest that much of the material that crashed into our young planet may have been swallowed up by Earth's core or ricocheted back into space, requiring more collisions to leave the elemental signatures scientists see in the crust today.

The young solar system was a violent place. Planetesimals, the massive objects that didn't quite manage to grow into planets, wound up destroying themselves as they crashed into other objects during a period known as late accretion. These collisions left traces of highly siderophile elements — metals have an affinity for iron, such as gold, platinum and iridium— within our planet's mantle.

SpaceX’s Falcon Heavy launch has been pushed to next year

  SpaceX’s Falcon Heavy launch has been pushed to next year SpaceX's Falcon Heavy rocket has been gearing up for its inaugural launch for quite some time, but multiple delays keep pushing that event later and later. In an email to Aviation Week, SpaceX President Gwynne Shotwell said, "We wanted to fly Heavy this year. We should be able to static fire this year and fly a couple of weeks right after that." The static fire test will be the first time that all of Heavy's 27 Merlin engines will be fired at once. And if all goes well there, Falcon Heavy should be ready for launch within the first few weeks of 2018.

After the sun spun to light, the planets of the solar system began to form . However, although Earth and the moon share much of the same material, the moon is much less dense than our planet, which would likely not be the case if both started with the same heavy elements at their core. " After colliding, the two similar-sized bodies then re-collided, forming an early Earth surrounded by a disk

The giant-impact hypothesis, sometimes called the Big Splash, or the Theia Impact suggests that the Moon formed out of the debris left over from a collision between Earth and an astronomical body the

[How the Moon Formed: 5 Wild Theories]

By measuring how much of these metals was mixed into the mantle, scientists estimated that about half a percent of the Earth's present mass came from colliding planetesimals. But these estimates assumed that the mantle held onto all of the highly siderophile elements.

New simulations suggest that instead, some of the material might have been carried all the way into the core, where it would have mixed up or would have been thrown out of the system entirely. Both outcomes would have reduced the amount of metals that would have mixed into the mantle. That means Earth may have absorbed two to five times as many impacts as previously thought.

a screenshot of a video game © Provided by Space.com

"We modeled the massive collisions and how metals and silicates were integrated into Earth during this 'late accretion stage,' which lasted for hundreds of millions of years after the Moon formed," Simone Marchi, a researcher at the Southwest Research Institute (SwRI) in Colorado and lead author of a Nature Geoscience paper outlining these results, said in a statement. Marchi worked with Robin Canup, also at SwRI, and Richard Walker, a geologist at the University of Maryland.

Iceballs at Edge of Our Solar System Could Hide Oceans

  Iceballs at Edge of Our Solar System Could Hide Oceans The finding means we may need to add places like Pluto and Eris to our list of potentially habitable destinations.“These objects need to be considered as potential reservoirs of water and life,” lead author Prabal Saxena, a planetary scientist at NASA’s Goddard Space Flight Center, said in a press release. “If our study is correct, we now may have more places in our solar system that possess some of the critical elements for extraterrestrial life.

This early planet, which has been named Theia, was partially absorbed into the Earth , but a large amount of debris was also sprayed out into space. Image: Artwork showing the massive collision between the Earth and another planet that may have formed the Moon (credit: Richard Bizley/SPL).

The moon likely exists due to a head-on collision between a much-younger Earth and a so-called "planetary embryo" known as Theia. The moon came into being

"Based on our simulations, the late-accretion mass delivered to Earth may be significantly greater than previously thought, with important consequences for the earliest evolution of our planet," Marchi said.

Follow Nola Taylor Redd at @NolaTRedd, Facebook, or Google+. Follow us at @Spacedotcom, Facebook or Google+. Originally published on Space.com.

Editor's Recommendations

  • How the Moon Evolved: A Photo Timeline
  • How the Moon Was Made: Lunar Evolution Explained (Infographic)
  • The Moon: 10 Surprising Lunar Facts

New island offers clues in search for life on Mars: NASA .
The world's newest island -- formed during a volcanic eruption in the remote Pacific three years ago -- may offer clues to how life potentially developed on Mars, NASA said Wednesday. The island of Hunga Tonga Hunga Ha'apai rose from the seabed about 65 kilometres (40 miles) northwest of the Tongan capital Nuku'alofa in late 2014-early 2015.Scientists initially expected the island -- created when vast quantities of rock and dense ash spewed from the Earth's crust -- to wash away within a few months.

—   Share news in the SOC. Networks

Topical videos:

This is interesting!