Search found 4 matches

by cdcdent
Wed Mar 17, 2010 7:22 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Phobos from Mars Express (2010 Mar 17)
Replies: 53
Views: 23530

Re: APOD: Phobos from Mars Express (2010 Mar 17)

The photo shows grooves running around the "moon" which cannot be caused by asteriod hits. They look like erosion in sedimentary rock. Seems to me we are looking at a small fragment of a much larger planet which had sedimentary rock not unlike our planet earth. After this small part floate...
by cdcdent
Wed Apr 18, 2007 8:15 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Red Square Nebula (APOD 16 April 2007)
Replies: 25
Views: 15756

Could this be yet another Einstein Cross?

http://asterisk.apod.com/vie ... hp?t=10380
by cdcdent
Tue Apr 17, 2007 7:49 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Red Square Nebula (APOD 16 April 2007)
Replies: 25
Views: 15756

This looks like a double reflection You get this effect with two mirrors at right angles (somewhat like a kaleidoscope) I believe this is possibly the first double gravitational lens The effect of each is at right angles to the other I leave it to the mathematicians to expalin it better than me
by cdcdent
Tue Apr 17, 2007 7:46 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Red Square Nebula (APOD 16 April 2007)
Replies: 25
Views: 15756

This looks like a double reflection

You get this effect with two mirrors at right angles (somewhat like a kaleidoscope)

I believe this is possibly the first double gravitational lens

The effect of each is at right angles to the other

I leave it to the mathematicians to expalin it better than me