Even more planets discovered via "wobble" method

An international group of astronomers using the High Accuracy Radial Velocity Planet Searcher (HARPS) have announced the discovery of 32 new planets, with many more announcements on the way. They had already announced the discovery of 43 other planets, bringing the total so far to 75. This is the result of a five year program of the European Southern Observatory that used a telescope in Chile.

Among the 75 planets discovered are 24 so-called super-Earths; planets with a mass just a few times that of Earth (not gas giants.) Only 28 super-Earths in total have been discovered by researchers around the world. This radial velocity method which looks for wobble is very good at finding these smaller planets.

The following link will show you an animation that demonstrates how the Radial Velocity Method works.

Radial Velocity Method

http://commons.wikimedia.org/wiki/File:Planet_reflex_sm.gif

Probe to crash into the moon on Parents Day!

A final location has been decided for the two-part lunar crash probe, part of the mission known as LCROSS (Lunar CRater Observation and Sensing Satellite), "On 9 October, at around 11:30 GMT, LCROSS will send its Atlas V's Centaur rocket upper stage towards the lunar surface (see pic). Four minutes after impact, LCROSS will descend through the plume using two "two near-infrared spectrometers, a visible light spectrometer, two mid-infrared cameras, two near-infrared cameras, a visible camera and a visible radiometer" to sniff the resulting chemical mix." (http://www.theregister.co.uk/2009/09/29/lcross_retargeted/ )

The LCROSS probe itself will then crash into the moon. The hope is that it will find evidence of water.

Well it all went as planned, and information about the event from NASA can be found at http://www.nasa.gov/mission_pages/LCROSS/main/index.html

A great video simulation can be found at http://www.nasa.gov/mov/391565main_LCROSS-MediaPreview.mov

A new, giant, massive ring has been discovered around Saturn- so large that a BILLION earths could fit in it! It is more than 300 Saturns wide! How could astronomers have missed it?

Well, it turns out the ring is almost invisible, that's how. While it is about 40 million kilometers across it is exceedingly thin. It is made of dust-like ice and rock particles that barely reflect any of the feeble sunlight that reaches Saturn- but the sun does heat them up. So it was the Spitzer infrared telescope that finally noticed the giant ring.