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Message: 1
From: National Science Foundation Update <nsf-update@xxxxxxx>
Date: Wed, 18 Jun 2008 12:00:26 -0500 (CDT)
Subject: The Mystery of Mass Extinctions Is No Longer Murky
The Mystery of Mass Extinctions Is No Longer Murky
If you are curious about Earth's periodic mass extinction events such as the sudden demise of the dinosaurs 65 million years ago, you might consider crashing asteroids and sky-darkening super volcanoes as culprits.
But a new study, published June 15, 2008, in the journal Nature, suggests that it is the ocean, and in particular the epic ebbs and flows of sea level and sediment over the course of geologic time, that is the primary cause of the world's periodic mass extinctions ...
This is an NSF News item.
Message: 2
From: National Science Foundation Update <nsf-update@xxxxxxx>
Date: Wed, 18 Jun 2008 14:17:08 -0500 (CDT)
Subject: Newly Born Twin Stars Are Far From Identical
Newly Born Twin Stars Are Far From Identical
Two stars, each with the same mass and in orbit around each other, are twins that one would expect to be identical. So astronomers were surprised when they discovered that twin stars in the Orion Nebula, a well-known stellar nursery 1,500 light years away, were not identical at all. In fact, these stars exhibited significant differences in brightness, surface temperature and possibly even size.
The study, which is published in the June 19 issue of the journal Nature, suggests ...
This is an NSF News item.
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