Hi, In determining the size of the airy disc in diameter, do you use: 1.22 * wavelength * f-ratio or 2.44 * wavelength * f-ratio?

Here's something interesting about ET and why to avoid the LGM: " In a study carried out by NASA and Pennsylvania State " University scientists, several...

That's the closest Comet Elenin will get to Earth. For comparison, the Sun is 93 million miles away. During a favorable opposition, Mars can be 35 million...

Can someone explain why the Saturn V had to be so big....7.5 million pounds of thrust? they were able to use smaller rockets in the missions leading up to...

Last fall a new program was released that allowed one to see many sky objects in their full extent, as if one had tremendous vision. I think it assumed you...

Multiverse Nonsense in the News http://www.astro.ucla.edu/~wright/cosmolog.htm#News 12 Aug 2011 - There has been a spate of news reports about a paper by...

Researchers in China have proposed sending a solar sail-driven probe to hit the asteroid Apophis to make sure it has no chance of going through a 'keyhole'...

http://news.sciencemag.org/sciencenow/2011/08/goodnight-old-moon.html "The team analyzed a 1.88-gram sample of a moon rock brought back to Earth by Apollo...

A planet the size of Mars races toward a planet like Earth, smashes into its crust and mantle, and ejects debris that conglomerates into a large moon. Sound...

How To Know If You Are A Crackpot http://www.npr.org/blogs/13.7/2011/07/14/137862826/how-to-know-if-you-are-a-crackpot Given all our discussions about what...

This article http://www.newsdaily.com/stories/tre77b3ox-us-britain-solar/ may have some truth to it; maybe the same factors that cause aurorae do affect...

It wasn't the quickest drive in history, but it was worth it. ...

The moons of Uranus follow the planet's rotational characteristics indicating some sort of magnetic signature to their motions...

White dwarfs gobble Earthlike treats http://www.sciencenews.org/view/generic/id/333363/title/White_dwarfs_gobble_Earthlike_treats "Remains of rocky bodies...

Sam, Always enjoy your postings. Regarding your recent posts on the subject of CME's, solar flares, and related events - would appreciate your comments on...

Google Groups is back. :-)

Oriel, Announced just in April/2011 along with two other finds (WASP-35b and 51b), WASP-48b requires 190 minutes to transit its mag 11.66 host star at a depth...

A toy. http://www.bbc.co.uk/news/world-us-canada-14497641

On Tue, 09 Aug 2011 02:41:39 GMT, (John Savard) wrote: Given the big list of newspapers, I suppose this must be another...

Here's some net buzz about the latest Usenet glitch. http://www.theregister.co.uk/2011/08/10/google_usenet_snafu/ Clear skies