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1 dzień temu · The James Webb Space Telescope has revolutionized astronomy in 2 years of operations, but how can it see a galaxy 33.8 billion light-years away in a universe that is only 13.8 billion years old?
4 dni temu · Webb will gaze into the epoch when the very first stars and galaxies formed, over 13.5 billion years ago. Ultraviolet and visible light emitted by the very first luminous objects has been stretched or 'redshifted' by the universe's continual expansion and arrives today as infrared light.
4 dni temu · Darren lives in Portland, has a cat, and writes/edits about sci-fi and how our world works. You can find his previous stuff at Gizmodo and Paste if you look hard enough. Here's how faint dwarf ...
2 dni temu · At the end of this epoch, the spherical volume of space which will become the observable universe is about 300 light-years in radius, baryonic matter density is on the order of 4 grams per m 3 (about 0.3% of sea level air density)—however, most energy at this time is in electromagnetic radiation.
4 dni temu · The two galaxies are separated by around 100,000 light-years, which is actually quite close in galactic terms.
4 dni temu · Webb’s view shows that their interaction is marked by a glow of scattered stars represented in blue. Known jointly as Arp 142, the galaxies made their first pass by one another between 25 and 75 million years ago, causing “fireworks,” or new star formation, in the Penguin.
1 dzień temu · PJ0116-24 is so far away that its light took about 10 billion years to reach us. A foreground galaxy acted as a gravitational lens, bending and magnifying the light of PJ0116-24 behind it into the ...
