Search found 7 matches

by donalgary
Wed Sep 15, 2021 8:57 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Cyclone Paths on Planet Earth (2021 Sep 15)
Replies: 26
Views: 15572

Re: APOD: Cyclone Paths on Planet Earth (2021 Sep 15)

I'd really like to see a four maps, each one for a five year period to see if there is a systematic change in the paths. Any suggestions?
by donalgary
Mon Jun 25, 2018 4:17 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Hayabusa2 Approaches Asteroid Ryugu (2018 Jun 25)
Replies: 31
Views: 13455

Re: APOD: Hayabusa2 Approaches Asteroid Ryugu (2018 Jun 25)

All pictures show view at nearly the same angle. Is that by by careful choice of pictures or because asteroid has very low angular momentum?
by donalgary
Tue Sep 17, 2013 2:24 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Galaxy Cluster Abell 1689 Deflects Light (2013 Sep 17)
Replies: 42
Views: 41728

Re: APOD: Galaxy Cluster Abell 1689 Deflects Light (2013 Sep

Can anyone tell me why the blue tint? If it's a blue shift, where does the energy come from? Are blue shifted spectral lines visible?
by donalgary
Sun Apr 28, 2013 4:57 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: A Raging Storm System on Saturn (2013 Apr 28)
Replies: 22
Views: 4530

Re: APOD: A Raging Storm System on Saturn (2013 Apr 28)

I think of Saturn's rings as being mostly empty space -- that is a satellite could fly through them with only a relatively small chance of being hit by anything. So why do they cast such a dense shadow?
by donalgary
Sat Mar 30, 2013 5:46 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: The Broad Tail of PanSTARRS (2013 Mar 30)
Replies: 14
Views: 7957

Re: APOD: The Broad Tail of PanSTARRS (2013 Mar 30)

Why do all the synchrones meat at a point?
It would seem that they should end at points spaced by the daily apparent motion of the comet.
by donalgary
Fri Dec 07, 2012 5:26 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Earth at Night (2012 Dec 07)
Replies: 83
Views: 12235

Re: APOD: Earth at Night (2012 Dec 07)

Why does Alaska appear much brighter than Hawaii?
by donalgary
Sat Aug 27, 2011 7:11 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Hurricane Irene Forms (2011 Aug 27)
Replies: 11
Views: 4435

Re: APOD: Hurricane Irene Forms (2011 Aug 27)

Why can't I see any trace of the day night cycle in the time lapse of hurricane Irene? Even if this is thermal imagery superimposed on a static background image I would expect the cloud top temperatures to change overnight. What's going on?