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, 5:28 AM ET (0928 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
3-D printer tested on ISS
Posted: Wed, Nov 26 7:10 AM ET (1210 GMT)

Astrobotic, CMU unveil lunar rover
Posted: Wed, Nov 26 6:55 AM ET (1155 GMT)

Pegasus wins contract for NASA satellite launch
Posted: Wed, Nov 26 6:38 AM ET (1138 GMT)

news links
Wednesday, November 26
Space station's 3D printer makes first part
collectSPACE — 7:33 pm ET (0033 GMT)
Meet the First 3-D Printed Object Made in Space
Popular Mechanics — 7:32 pm ET (0032 GMT)


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