[meteorite-list] Asteroids May Not Be Planet Building Blocks After All

From: Shawn Alan <shawnalan_at_meteoritecentral.com>
Date: Fri, 16 Jan 2015 11:26:50 -0700
Message-ID: <20150116112650.e8713c95af9984a493c5db01816d4c10.37f45ba6b9.wbe_at_email22.secureserver.net>

Hello Lister

I thought it was the 7 days of creation that started life on Earth.

Enjoy

Shawn Alan
IMCA 1633
ebay store http://www.ebay.com/sch/imca1633ny/m.html
Website http://meteoritefalls.com



Asteroids May Not Be Planet Building Blocks After All

by Charles Q. Choi, Space.com Contributor | January 16, 2015 07:00am
ET

Asteroids have long been regarded as planetary building blocks. But they
may actually be byproducts of planet formation, born when violent
collisions smashed an earlier generation of objects apart, a new study
suggests.

Asteroid fragments that fall to Earth as meteorites often contain tiny,
round pellets called chondrules that formed when molten droplets quickly
cooled in space in the solar system's early years. Chondrules are found
in 92 percent of all meteorites, and are often thought to be the
building blocks of planets.

Chondrules were part of the protoplanetary disc of gas and dust
surrounding the newborn sun that gave birth to Earth and the other
planets. A recent study found that chondrules formed about 1 million
years after planetesimals ? the building blocks of protoplanets ?
came together. [When Space Attacks: The 6 Craziest Meteor Impacts]

Prior research had suggested that chondrules in some meteorites were
probably born when rocks in space collided at speeds of more than 22,370
mph (36,000 km/h). However, it was uncertain how the majority of
chondrules formed.


Source: http://www.space.com/28272-asteroids-planet-building-blocks.html
Received on Fri 16 Jan 2015 01:26:50 PM PST