Galaxies

Category archives for Galaxies

“The evidence at present available points strongly to the conclusion that the spirals are individual galaxies, or island universes, comparable with our own galaxy in dimension and in number of component units.” -Heber Curtis, 1920 In many different areas of life, we settle disagreements by popular vote. But in science, we know better; regardless of…

“In order for the light to shine so brightly, the darkness must be present.” -Francis Bacon If you had previously thought the Universe contained a certain amount of stuff, like stars, galaxies and matter, then you might think that learning it had ten times as many galaxies might mean it had ten times as much…

“Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save…

“They most likely form as subsystems within looser associations and evolve by gravitational processes. Strong galaxy interactions result and merging is expected to lead to the ultimate demise of the group. Compact groups are surprisingly numerous, and may play a significant role in galaxy evolution.” -Paul Hickson With hundreds of billions of galaxies in an…

“Nothing in the standard cosmological model predicts this, and it is almost impossible to imagine how that model could be modified to explain it, without discarding the dark matter hypothesis completely.” -David Merritt Dark matter is a hugely successful theory for explaining a whole slew of observations about the Universe. Just by adding this one ingredient…

“We conducted the first fully blind, three-dimensional search for cool gas in the early universe. Through this, we discovered a population of galaxies that is not clearly evident in any other deep surveys of the sky.” -Chris Carilli The Hubble Ultra Deep Field and its successor images represent humanity’s deepest views of the stars in…

“Mapping out the elements in a star is like reading its DNA. We’re using those DNA readings to decode the history of the Milky Way from the stars that we can observe today.” -Steven Majewski Most of the stars in our Milky Way have long lives ahead of them, with dozens or even hundreds of…

“These galaxies are among the most massive galaxies in the universe and are believed to have rapidly formed their stars a long time ago. However, how these galaxies formed and why have they stopped forming new stars remain mysteries.” -Tao Wang, lead author on this new study There was once a time early on in…

“Motions of the stars tell you how much matter there is. They don’t care what form the matter is, they just tell you that it’s there.” -Pieter van Dokkum Everything in the Universe was born with the same ratios of dark matter to normal matter: approximately 5-to-1. It shows up in everything from the cosmic…

“This suggests a lack of Cepheids in the inner 2.5 kpc region of the Galactic disc except the [Nuclear Stellar Disc].” –N. Matsunaga et al. If you want to find where all the young stars in a galaxy are, you look for the densest regions of gas and dust: the locations where new stars and star…