If we assumeΩm= 1, the predicted degree of cluster evolution is consistent with the data for non-gaussian models where the primordial fluctuations have at least two times as many peaks of height 3σ or more as a gaussian distribution does. Given an independent measurement ofΩm, the ...
A galaxy is a cluster of stars, nebulae, dark matter, and other astronomical objects. There are three primary galaxy shapes, which...
MywifeCatherineandIweredrivingalongwhatsomepeoplecalledmoose(麋鹿)alley.Itwasso 1 thattherewerefewcarsontheroad. 2 ,amoosejumpedoutacrossourpath.Ihadbeen drivingforyearsandwas 3 indriving.Inordertoavoidknocking 4 themoose,Imadea quickturntotheotherlane.IfIhadnotdonethat,themoosemighthavebeenkilled,andm...
A galaxy is a large group of stars that orbit around a common point usually a Supermassive Black Hole. Some galaxies, such as the dwarf Galaxy called Segue 2, do not have a Supermassive Black Hole but rather orbit a central gravitational point. The word galaxy comes from the French ...
Our planet provides enough light to spot some of the larger craters. Credit: Bob King While the crescent is illuminated by direct sunlight, you’ll also see the full outline of the Moon thanks to earthshine. Sunlight reflected off Earth’s globe faintly illuminates the portion of the Moon ...
Our Milky Way is just an example of a galaxy, though. There is another type of galaxy called elliptical, and they’re even more common. The smallest galaxies in the Universe, the ultra-compact dwarf galaxies are only a little larger than a globular star cluster. But then the largest galax...
Even in our own galaxy, globular cluster Messier 69 shows evidence that stars had up to 22% of our Sun’s heavy element content by the time the Universe is just 700 million years old: approaching the conditions needed for rocky planets and life processes in under a billion years of cosmic...
While Omega Centauri is probably the largest globular cluster in the Milky Way, that doesn't mean it's the largest one we know of. For instance, our nearby neighbor the Andromeda galaxy has a globular cluster, Mayall II, orbiting it — and this cluster is twice the size of Omega Centauri...
The biggest known galaxy, first described in a 1990 study from the journalScience, is IC 1101, which stretches as wide as 4 million light-years across,according to NASA. Galaxies are often bound to each other gravitationally in groups that are calledgalaxy clusters. (The Milky Way, for examp...
An international team led by astrophysicist Hakim Atek of the Institut d'Astrophysique de Paris turned to JWST data on a galaxy cluster called Abell 2744, backed up by data from Hubble. Abell 2744 is so dense that space-time warps around it, forming a cosmic lens; any distant light traveli...