The stars near the edges of spiral galaxies revolve with the same angular velocity as stars close to their centers. [That’s very unlike the planets near the edges of our solar system.]
Newtonian theory, which explains our solar system well, suggests that stars farther away ought to move slowly, so "extra gravity" is thought to be necessary. Without the extra gravity those most distant stars would leave the galaxy. They don’t leave the galaxy so theoretical physicists, aka mathematicians, add more gravity to their equations. They couldn’t see the cause of their imagined gravity so “dark matter” was invented.
For eighty five years it’s been searched for, talked about, and taught at huge cost to taxpayers.
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Feel free to reply to any comment by clicking the "Reply" button.What is the problem, paying for science that does not pan out? I think it is a good investment. How would your life be better without air traffic tracking in real time, the cell phone, GPS, the invention of all the imaging equipment used for medical treatments, and all the other stuff that uses computers and the laws of physics to work? The economy of present depends on science and physics research, we all get the benefits so we should all help in its work.
dalefvictor
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Aug 23, 2020
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Dale, you are a man of faith.
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Posted by starwatcher-alThe occultation of Mars on the 7th.
Posted by starwatcher-alThe occultation of Mars on the 7th.
Posted by starwatcher-alSolar minimum was in 2019 so the sun is ramping up in flares, spots and prominences.
Posted by starwatcher-alI missed the early phases of the eclipse but the clouds mostly left during totality. All in all a great eclipse. Next one is Nov. 8-22
Posted by starwatcher-alI missed the early phases of the eclipse but the clouds mostly left during totality. All in all a great eclipse. Next one is Nov. 8-22
Posted by RobecologyFor those following the JWST.
Posted by AnonySchmoose The post-launch set-up of the new James Webb telescope has gone very well.
Posted by HumanistJohnImages taken with Stellina (80 mm): M33 Triangulum Galaxy M1 Crab Nebula NGC281 Pacman Nebula in Cassiopeia NGC 6992 Veil Nebula in Cygnus
Posted by HumanistJohnImages taken with Stellina (80 mm): M33 Triangulum Galaxy M1 Crab Nebula NGC281 Pacman Nebula in Cassiopeia NGC 6992 Veil Nebula in Cygnus
Posted by HumanistJohnImages taken with Stellina (80 mm): M33 Triangulum Galaxy M1 Crab Nebula NGC281 Pacman Nebula in Cassiopeia NGC 6992 Veil Nebula in Cygnus
Posted by HumanistJohnImages taken with Stellina (80 mm): M33 Triangulum Galaxy M1 Crab Nebula NGC281 Pacman Nebula in Cassiopeia NGC 6992 Veil Nebula in Cygnus
Posted by HumanistJohnImages taken October 2nd 2021 with Stellina 1.
Posted by HumanistJohnImages taken October 2nd 2021 with Stellina 1.
Posted by HumanistJohnImages taken October 2nd 2021 with Stellina 1.
Posted by starwatcher-al Did you know that you can see Venus in the daytime?
Posted by starwatcher-alOne of these days I think that I'll figure out this Nikon.