Search found 5 matches

by Bubblecar
Mon Jul 14, 2008 5:18 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Mars (+ Canals) (APOD 14 Jul 2008)
Replies: 5
Views: 3317

Mars (+ Canals) (APOD 14 Jul 2008)

Today's picture, Changes in Angular Mars - all images taken from Earth at the same magnification - reveals quite a lot of cobweb-like canals, especially in the third line of images. With today's CCD images, it's easier to understand how Lowell & the others got so carried away :)
by Bubblecar
Sun Feb 17, 2008 9:22 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Crab Neb (APOD 17 Feb 2008)
Replies: 12
Views: 5283

The nebula shines due to synchrotron radiation, the source of the particles being the pulsar wind. However, the exact mechanics of the situation have been a matter of debate. There's a paper discussing various models here: http://arxiv.org/PS_cache/astro-ph/pdf/0702/0702512v2.pdf It's a very express...
by Bubblecar
Thu Jan 24, 2008 4:53 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Shelf Cloud (APOD 22 Jan 2008)
Replies: 39
Views: 20066

The Earth is a planet, in a solar system, in a galaxy, in the universe. It's atmosphere is arguably the most interesting we can observe, involving all sorts of spectacular & intriguing structures. These can be related, to some extent, to some of the events we see unfolding in the atmospheres of ...
by Bubblecar
Thu Jan 24, 2008 4:31 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Majestic Andromeda (APOD 24 Jan 2008)
Replies: 8
Views: 3103

Majestic Andromeda (APOD 24 Jan 2008)

I remember admiring the work of Tony Hallas & Daphne Mount in US astronomy magazines in the '80s & '90s. In those days they were using modestly sized but high quality apochromatic refractors & long exposures on hypered film. I notice on their website that these days they are "all di...
by Bubblecar
Mon Jan 21, 2008 8:44 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: Mercury's craters, size, MESSENGER, Vulcan (APOD 21 Jan 08)
Replies: 22
Views: 9936

Yes, I think they meant to write "more shallow" not "less shallow".