Never in the middle of a busy city say, Stockholm..
Well it fell uncontrollably and it was predicted to fall in the outer fringes of the possible latitude range at first; so it could've been New York City or something. Would've been not as bad as an asteroid hit but it sure would've killed a few people in an urban area. Luckily the likelihood was always the ocean and surprisingly in the end it veered towards the tropical latitudes and ended up at 24°S.
Pretty interesting. Hopefully that doesn't happen in our neighbourhood of the galaxy.
If dark matter is "clumpy," then it's concentrated in irregular chunks distributed roughly across galaxies — much like the luminous matter we see concentrated in stars and nebulae. Some alternative theories, including theories that suggest dark matter doesn't exist at all, wouldn't include any clumps — and would have the effects of dark matter distributed smoothly across galaxies.
So far, Bonaca's discovery is one of a kind, so new that it hasn't yet been published in a peer-reviewed journal (though it was met appreciatively by the crowd of physicists at the prestigious conference).
To pull it off, she relied on data from the Gaia mission, an European Space Agency program to map billions of stars in our galaxy and their movements across the sky. It formed the best existing catalog of the stars that seem to be part of GD-1.
Bonaca buttressed that data with observations from the Multi Mirror Telescope in Arizona, which showed which stars were moving toward Earth, and which were moving away. That helped distinguish between stars that were really moving with GD-1, and those that just sat next to it in Earth's sky. That effort produced the most precise image ever of GD-1, which revealed the second gap, the spur, and a previously unseen region of the stellar stream.
Down the road, Bonaca said, she wants to do more mapping projects to reveal other regions of the sky where something unseen seems to be knocking stars around. The goal, she said, is to eventually map clumps of dark matter all across the Milky Way.
Dude I know, I own several telescopes and the skies here are amazing. Shame the people and businesses are backwards inbred dickheads. Fortunately Adelaide and Mildura are not too far away.
That dark sky reserve is planned for near Blanchetown, which is halfway between here and Adelaide. My dark sky site is 20km north of town and is very dark, but I have another site another 50km further up, near the SA/NSW border which is a black zone, but the dirt road is horrendous so I never use it. The 2km of corrugations and potholes to get to my present site are distressing enough for both me, my car and my telescopes!
Just imagine far out in the deserts of, well anywhere in Australia. Flying from Melbourne towards Europe, there is over 3 hours of what is essentially the surface of Mars.
1) Significant flare events can cause short term or long term warming depending on severity, as well as magnetic reversal.
2) Micronova events can cause ice ages and magnetic reversal. Ice ages occur via rapid evaporation of water, then rapid deposition of that water as snow, and prolonged cold temps due to "dust" and other solar particles between the sun and earth, as well as in earth's atmosphere.
I recommend watching it though, as it's only 5 minutes.
Last Edit: Apr 30, 2020 23:49:14 GMT -5 by Kändel-san