Search found 3 matches

by khbynum
Wed Dec 09, 2015 4:24 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Arp 87: Merging Galaxies from Hubble (2015 Dec 09)
Replies: 19
Views: 3429

Re: APOD: Arp 87: Merging Galaxies from Hubble (2015 Dec 09)

What's the spiky red object north of NGC 3808B? I'd say a nearby star, except that it doesn't look round and seems to be leaving a faint trail in the 2 o'clock direction!
by khbynum
Tue Nov 04, 2014 8:59 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Moon and Earth from Chang'e 5-T1 (2014 Nov 04)
Replies: 43
Views: 172486

Re: APOD: Moon and Earth from Chang'e 5-T1 (2014 Nov 04)

They have enough angular separation that it does matter, as you have observed. I was able to quite easily recreate a similar set of illuminations using Universe Sandbox. I made the background gray so that the whole spheres of both bodies are visible. Edit: To add further to this observation I would...
by khbynum
Tue Nov 04, 2014 6:31 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Moon and Earth from Chang'e 5-T1 (2014 Nov 04)
Replies: 43
Views: 172486

Re: APOD: Moon and Earth from Chang'e 5-T1 (2014 Nov 04)

I'll admit I'm not good with 3-dimensional relationships, but I assume that the Sun is essentially equidistant from Earth and Moon. So, they should be equally illuminated. Why does the Moon appear "fuller" than Earth?