ElReptil
ElReptil t1_jc1vqqh wrote
Reply to comment by auraseer in As they still have a neutral charge, can antineutrons replace neutrons in a regular atom? by Oheligud
>and causes a massive explosion that destroys half the continent
That kind of depends on how many antineutrons are actually in a liter jar, which I guess could be anywhere from a handful in a magnetic trap to a chunk with the density of nuclear matter.
Fun fact: the energy released by the annihilation of one liter of antimatter at that density (roughly a hundred billion tons) is weirdly close to the gravitational binding energy of Earth.
ElReptil t1_jahdw4o wrote
Reply to comment by Bewaretheicespiders in Satellite Constellations Are an Existential Threat for Astronomy by ChieftainMcLeland
>Starlink pays for Starship which will make space telescopes affordable, and ground astronomy obsolete for science purpose
No. Launch costs are not what makes space telescopes expensive, and Starship won't make it possible to build space telescopes anywhere near the size of current and near-future ground-based telescopes. Space telescopes complement ground-based observatories, but they won't replace them anytime soon.
ElReptil t1_j8tyikx wrote
Reply to comment by PickleJesus123 in The Nancy Grace Roman Space Telescope - the next major step in astronomy that will help unlock the secrets of the universe's expansion and dark energy. by upyoars
There are lots of people going back to the drawing board every day, but so far none of them have found a better model than Lambda-CDM. Certainly not for lack of trying, though.
ElReptil t1_jc2qsbt wrote
Reply to comment by 14domino in The largest NASA Hubble Space Telescope image ever assembled, this sweeping bird’s-eye view of a portion of the Andromeda galaxy. Credit: NASA, ESA by Davicho77
> i assume in a few billion years as it gets closer it would get brighter and bigger
Bigger yes, but the surface brightness would actually stay the same (until you start to resolve individual stars). You would probably still be able to see more than you do now because the eye is better at seeing dim, large objects.