Galaxies

Category archives for Galaxies

“Gamow was fantastic in his ideas. He was right, he was wrong. More often wrong than right. Always interesting; … and when his idea was not wrong it was not only right, it was new.” -Edward Teller Considering what we know about our Universe today, it’s hard to believe that just a century ago, Einstein’s…

“I know there is strength in the differences between us. I know there is comfort where we overlap.” -Ani DiFranco The observable Universe is a big, big place. Some 46 billion light years in all directions, with hundreds of billions of galaxies inside, it’s no wonder that we see stars and galaxies in all directions…

“If the expansion of the space of the universe is uniform in all directions, an observer located in anyone of the galaxies will see all other galaxies running away from him at velocities proportional to their distances from the observer.” -George Gamow When Einstein put forth his space-and-time changing theory of General Relativity, one of…

“The farther we peer into space, the more we realize that the nature of the universe cannot be understood fully by inspecting spiral galaxies or watching distant supernovas. It lies deeper.” -Robert Lanza When you take a look at a spiral galaxy in the night sky, it seems obvious that the stars on the inner…

“A dwarf standing on the shoulders of a giant may see farther than a giant himself.” -Robert Burton Both the internal motions of individual galaxies and the wholesale motions of galaxies within clusters require much more mass than normal matter — protons, neutrons and electrons — can account for: about five times as much. Because…

“Twinkle, twinkle quasi-star. Biggest puzzle from afar. How unlike the other ones. Brighter than a billion suns. Twinkle, twinkle, quasi-star. How I wonder what you are.” -George Gamow One of the most interesting classes of objects in the entire sky is one that’s invisible to the naked eye, yet appears brighter than anything else in…

Happy birthday, Edwin Hubble (Synopsis)

“Equipped with his five senses, man explores the universe around him and calls the adventure Science.” -Edwin Hubble Back in the 1920s, Einstein’s general relativity had just come out and gained acceptance, and a debate was raging over whether the spirals in the sky were within our own galaxy, or were entire galaxies unto themselves.…

“Based on our understanding of how galaxy clusters grow from the very beginning of our universe, this cluster should be one of the five most massive in existence at that time.” -Peter Eisenhardt While deep galaxy surveys from telescopes like Hubble are great for identifying distant individual galaxies, they’re not wide-field enough to find massive…

Ask Ethan #111: Do Galaxies Die? (Synopsis)

“Unless one says goodbye to what one loves, and unless one travels to completely new territories, one can expect merely a long wearing away of oneself and an eventual extinction.” –Jean Dubuffet The Universe is in its heyday right now: hundreds of billions of galaxies are visible from any point, clustered together in a glorious…

When young galaxies are first formed, they’re accompanied by tremendous bursts of star formation, giving rise to billions of new stars within just a few million years. Yet how these galaxies first form in the initial stages is very much an open question. In addition, pretty much every large galaxy we find — even in…