spacetoday.net: space news from around the webin association with SpaceNews


Lunar rock study raises new questions about Moon formation model
Posted: Tue, Mar 27, 2012, 6:28 AM ET (1028 GMT)
Newly-published measurements of titanium concentrations in lunar rocks have led scientists to question the current model for the formation of the Moon. In a study published Sunday by Nature Geoscience, scientists reported that the relative abundance of two isotopes of titanium in lunar rocks collected during the Apollo missions is identical to that found in the Earth's mantle. That result, they argue, is at odds with the current model for the formation of the Moon after a Mars-sized planetesimal collided with the proto-Earth. That planetesimal is believed to have been chemically distinct from the Earth and would have accounted for 40 percent of the mass of the Moon, so scientists expected the relative abundances of those titanium isotopes to be different on the Moon than the Earth. The funding suggests that the formation model may need to be altered or possibly replaced with other mechanisms that can better explain the similar compositions.
<<previous article   next article>>
news in brief
Rocket Lab set for first launch
Posted: Sun, May 21 10:04 AM ET (1404 GMT)

NASA facing cuts in 2018 budget proposal
Posted: Sun, May 21 10:03 AM ET (1403 GMT)

Soyuz launches SES-15 satellite
Posted: Sun, May 21 10:02 AM ET (1402 GMT)

news links
Friday, May 26
NASA’s SDO Sees Partial Eclipse in Space
NASA/GSFC — 6:28 pm ET (2228 GMT)


about spacetoday.net   ·   info@spacetoday.net   ·   mailing list