Tuesday, April 27, 2021
Saturday, April 24, 2021
Thursday, April 22, 2021
What's the truth about antigravity?
https://www.youtube.com/watch?v=_SGnOeGZUAU
I had a manager who believed that since magnetism is a dipole, that we should also have positive and negative gravity. The problem with this idea is that it is likely a bad analogy. I have seen videos stating that gravity is not a force, but a by-product of moving through curved spacetime. (I am still skeptical of the "spacetime" concept, thinking of it only as a useful and accurate model.)
Anti-matter is simply matter that has an opposite charge. There is no reason to think that it would be affected in a different way by gravity. If it were, I think that we would have to rewrite the laws of physics.
Sunday, April 18, 2021
Saturday, April 17, 2021
Betelgeuse Is Not How You'd Imagine
Sometime in the next million years, and nobody knows when, Betelgeuse will explode.
Wednesday, April 14, 2021
Dark Matter's Last Stand - Scientific American
Scientists are fond of saying negative results are just as important as positive results, but after several decades of not finding something, researchers can be forgiven for feeling impatient. Back in the 1990s, experiments began trying to detect the particles that make up dark matter, the ubiquitous yet untouchable invisible material that apparently fills the cosmos. Since then, physicists have found more and more evidence that dark matter is real but not a single sign of the stuff itself.
Tuesday, April 6, 2021
Sunday, April 4, 2021
AMAZING INVENTIONS THAT ARE NEXT LEVEL!
Not sure how many of these are useful. Some inventions can be cool but not cost-effective. This reminds me of looking at magazines in the 1970s where they predicted that we would have nuclear-powered cars by the year 2000.
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