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Posts by Peter Laursen
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Neutronstjerner giver astronomer en ny måde at måle Universets udvidelse på
De seneste år har astronomien stået i lidt af en krise: Selvom vi ved at Universet udvider sig, og selvom vi ved nogenlunde hvor hurtigt, stemmer de to vigtigste måder til at måle denne hastighed ikke overens. Nu foreslår astrofysikere fra Niels Bohr Institutet en ny målemetode, som potentielt kan løse krisen.
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Colliding neutron stars provide a new way to measure the expansion of the Universe
In recent years, astronomy has seen itself in a bit of crisis: Although we know that the Universe expands, and although we know approximately how fast, the two primary ways to measure this expansion do not agree. Now astrophysicists from the Niels Bohr Institute suggest a novel method which may help resolve this tension.
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Astronomers discover newborn galaxies with the James Webb Space Telescope
With the launch of the James Webb Space Telescope, astronomers are now able to peer so far back in time that we are approaching the epoch where we think that the first galaxies were created. Throughout most of the history of the Universe, galaxies seemingly tend to follow a tight relation between how many stars they have formed, and how many heavy elements they have formed. But for the first time we now see signs that this relation between the amount of stars and elements does not hold for the earliest galaxies. The reason is likely that these galaxies simply are in the process of being created, and have not yet had the time to create the heavy elements.
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Danske astronomer opdager nyfødte galakser med rumteleskopet James Webb
Med opsendelsen af rumteleskopet James Webb er astronomer nu i stand til at kigge så langt tilbage i tiden, at vi nærmer os den epoke, hvor vi tror de første galakser blev dannet. Gennem det meste af Universets historie ser de fleste galakser ud til at følge en tæt relation mellem hvor mange stjerner de har dannet, og hvor mange tungere grundstoffer de har dannet. Men for første gang ser vi nu tegn på, at denne relation mellem mængden af stjerner og grundstoffer ikke holder for de tidligste galakser. Årsagen er sandsynligvis, at disse galakser simpelthen er i gang med at blive skabt, og endnu ikke har nået danne de tunge grundstoffer.
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Astronomy Picture Of the Day
- UntitledA good place to see a ring-of-fire eclipse, it seemed, would be from a desert.
- A Harvest Moon over TuscanyFor northern hemisphere dwellers, September's Full Moon was
- Back from BennuBack from Bennu