Starship Asterisk*

+1 Thanks

Very interesting topic to me (and obviously several others). thanks to all for the comments, clarifications, and details.

Brian

In cosmology we're usually concerned with two measures of distance: light travel time and comoving distance. The meaning of the first is pretty obvious; the second describes the current distance to the point where the light was emitted, considering the expansion of space during that time. The two a...

Able to pick up something that happened in less than half a second, 1.3 billion years ago. simply amazing. I have wondered how black holes got rid of all that energy from the inflow of mass.

Art: thanks for the numbers. Had no idea about the neutrino production difference between the types of supernova. The distance factor makes even more difference though.

Brian

Did any neutrino detectors report a rise in neutrino count associated with this supernova?

Makes a really busy picture.

Very helpful image to locate the comet. I should be able to find it tonite.

The APOD shows the comet to the right and above M101. The "telescopic two panel mosaic" link shows the same (?) picture but the comet is to the left and above M101. Which version would I see looking into the night sky with a telescope?

+1 Awesome APOD. Who would have thought any moon was "sloshing" around in orbit!

+1 fantastic APOD.

Ann, thanks for the additional pictures and info. It really adds to already interesting APOD.

Great shot! Really eye-catching.

Sure looks like a planet to me .

Great subject. Thanks for the video and adding orbit lines for the smaller moons. Would have missed them otherwise.

I really like the composition of this picture. the annotations are especially welcome. I sure would have missed Mercury.

I would guess that Pluto's eccentric orbit results in a long cold, cold "winter" and a long less-cold "summer". Could result in freeze, thaw, evaporate, rain cycle of different materials throughout Pluto's year??

I now realize I thought of comets as a "kind of smooth" structure with long tail. Obviously rough, craggy, boulders, etc. Great pictures.
Way to go Philae, Rosetta, and ESA.

Thanks Tunc Tezel and APOD. I have heard of and know what the retrograde motion is, but I have never seen an actual plot of the motion. Great plot.

How much time (days, hours, minutes??) does the video represent? I saw the date of the event.

Thanks. That makes sense now. I knew I had to be missing something.
Brian

know a little about CMB, expansion, etc. Looked at the map, read the discussions. Still do not understand what the red in middle of the blue means. If we are moving in the direction of blue shifted areas, how are we moving away from the red area in the middle of the blue. Or is the red indicating so...

Great visual effect! Shadow and light moving across a spinning globe.

Cousin Rickey: Here is a link to a skychart that looks good to me. Can be customized quite a bit.

http://www.skyviewcafe.com/skyview.php

RJN: Thanks for the extra links. I will be using them if necessary.

Art: thanks for the power spectra input. Unfortunately I am just an interested retired civilian. I have a little math background but too long ago. I'll need to do some research on your clips and comments for it to mean much to me. Something new to work on, at least for me.

Nice 3D visualization. really looks like random fluctuations, but looks can be deceiving.