Comments of the Week #70: From the ultimate darkness to variable stars
“If antimatter falls up, we would be tremendously surprised. A lot of things would be wrong. E=mc^2 would be wrong, for one, or gravitational and inertial mass would not be identical. We’re doing the experiment because we have to check all our theories and expectations against the evidence, but we have been attempting to measure this for maybe 50+ years now, and haven’t been able to create and track neutral antimatter precisely enough to check it out. We will keep trying, and hopefully we’ll verify that it falls in a gravitational field just like we expect.
We see antimatter ejecting out of galactic “jets” with the same velocity profiles as we see for normal matter, so we do expect it to behave gravitationally just like matter does. But we don’t know for certain until we check. Still, if it turned out that antimatter falls up, I would say it’d be the biggest surprise and discovery of the 21st century. I’ll keep watching.”
Ever wonder if antimatter falls up? If black holes could be dark matter? If life in other galaxies is different from our own? Or if there’s any evidence besides spinning galaxies for dark matter halos? Come find out all this and more on this edition of our comments of the week!