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Science and Astronomy Videos

Posted: 08 Apr 2019 09:31
by midtskogen
midtskogen wrote:
Rocket experiment as recorded by one of our meteor cameras (8x speed).  The launch from Andøya in northern Norway was part of NASA's AZURE experiments to study northern lights.

Today's APOD

Science and Astronomy Videos

Posted: 15 Apr 2019 02:07
by Stellarator

Science and Astronomy Videos

Posted: 15 Apr 2019 02:43
by Watsisname
Stellarator, very cool episode.  Fortunately, while it makes for a great cosmic horror story, I think we can safely rule out a strange apocalypse by a simple observation:  most of the heavy elements on Earth above atomic number 44 were forged in the collisions of neutron stars.  That includes most gold, platinum, iodine, iridium, and bismuth:

Image

If most of these atoms came from colliding neutron stars, and if neutron stars contain any appreciable amount of strange matter at all, and if strange matter has these claimed properties, then most stars including our own should have already been hit by strangelets and converted into strange stars.

We can also rule out strangelets as a significant component of dark matter, because most of the dark matter must be older than the first stars, and even the CMB.

Science and Astronomy Videos

Posted: 15 Apr 2019 15:48
by A-L-E-X
It's amazing to think that all the gold and silver in the world was formed by neutron star collisions (or possibly supernova explosions?)

Science and Astronomy Videos

Posted: 16 Apr 2019 01:49
by JackDole
A-L-E-X wrote:
Source of the post r possibly supernova explosions?

No. Supernova generated elements are the green elements in the table. The energy of a supernova is not enough to create elements like gold and higher!

Science and Astronomy Videos

Posted: 16 Apr 2019 02:17
by Stellarator
Watsisname wrote:
Source of the post Fortunately, while it makes for a great cosmic horror story, I think we can safely rule out a strange apocalypse by a simple observation...

These were my thoughts as well - but that does not rule out the fact that this stuff is criminally underused by genocidal aliens for galactic warcrimes :P!

Science and Astronomy Videos

Posted: 20 Apr 2019 04:01
by vlad01

Science and Astronomy Videos

Posted: 22 Apr 2019 03:07
by Stellarator

Science and Astronomy Videos

Posted: 24 Apr 2019 21:20
by Watsisname
And another excellent explanation by PBS Space Time


Science and Astronomy Videos

Posted: 28 Apr 2019 00:23
by Stellarator
I don't know if this has been posted yet, but I thought it was very cool:





Also, some here are some newer images from the Mars Curiosity Rover (spoiler: they are mostly rocks and added wind effects).





And this recent measurement of a solar eclipse on Mars is also neat: https://www.nasa.gov/feature/jpl/curiosity-captured-two-solar-eclipses-on-mars

Science and Astronomy Videos

Posted: 01 May 2019 13:22
by DoctorOfSpace

Science and Astronomy Videos

Posted: 08 May 2019 20:26
by DoctorOfSpace

Science and Astronomy Videos

Posted: 09 May 2019 00:59
by Watsisname

Science and Astronomy Videos

Posted: 12 May 2019 01:01
by Stellarator

Science and Astronomy Videos

Posted: 12 May 2019 02:10
by vlad01
DoctorOfSpace wrote:

I have always wondered if life on Earth started independently more than once given the conditions and abundance of organic chemistry available?