Starship Asterisk*

The color of the meteor is very green and unchanging. My impression is that most meteor images show the meteors to be generally changing color, and while they may well be green, this sharply yellow-green and unchanging color is one I have not seen in photos before. Ann Ann, while it may be rare to ...

So, I noticed the blue 'Theta" (Θ) in the upper-right corner of APOD's image. (Upper left of the APOD display image, upper right of the source image.) Blue Theta.png Is this a background elliptical galaxy with a wisp of dense gas/dust from NGC3310 forming the 'bar,' or is the 'bar' associated w...

I thought this image from planck was interesting enough... http://www.esa.int/var/esa/storage/images/esa_multimedia/images/2014/12/the_magnetic_field_along_the_galactic_plane/15110855-1-eng-GB/The_magnetic_field_along_the_Galactic_plane_node_full_image_2.jpg http://www.esa.int/spaceinimages/Images/2...

So...

The chart indicates that all Helium was produced in the Big Bang. Since the major source of energy from stars on the main sequence is in the fusion of Hydrogen into Helium, has not enough helium been produced in stars to be a factor in the helium mass equation as of yet?

Lou

Ran across this earlier today - found it interesting.

http://www.nasa.gov/image-feature/coron ... spot-group

Stacked images where coronal lines help visualize the shape of magnetic fields on the sun.

reduced size image

Any theories as the the source of the light colored 'worm-tracks' near the crevice at the center of the image? (section below, w markup)


Lou

the brighter core is roughly oval, and it's near cygnus, so... Swans Egg Nebula

or since the entire nebula appears more rectangular in shape, the Flying Carpet Nebula

Given the juxtaposition of the impact crater to the slump, it would appear that meteor impact was responsible for the slump. If this is the case, would you think that the impact shock wave caused the slump directly, or, it was indirectly caused by residual heat from the impact, melting ice at the ca...