expanding

Tag archives for expanding

“Light thinks it travels faster than anything but it is wrong. No matter how fast light travels, it finds the darkness has always got there first, and is waiting for it.” -Terry Pratchett It’s the end of the week once again, and so let’s have a go at another Ask Ethan! Perhaps inspired by a great…

“We find them smaller and fainter, in constantly increasing numbers, and we know that we are reaching into space, farther and farther, until, with the faintest nebulae that can be detected with the greatest telescopes, we arrive at the frontier of the known universe.” -Edwin Powell Hubble With 110 deep-sky objects scattered throughout the heavens,…

“Anyone who has never made a mistake has never tried anything new.” -Albert Einstein Back when Einstein first proposed his theory of General Relativity, his revolutionary picture of the Universe was met with a mix of curiosity, awe, and intense skepticism. It isn’t every day that your most cherished of all physical theories — the…

How Big is Our Observable Universe?

“The mind, once expanded to the dimensions of larger ideas, never returns to its original size.” -Oliver Wendell Holmes When General Relativity supplanted Newton’s work as our theory of how gravity works in the Universe, it didn’t just change how we view how masses attract, it gave us a new understanding of what the questions where…

Astronomers make use of… molecules?

When I think of molecules, I think of Conan O’Brien doing his skit where he plays Moleculo… the molecular man! I don’t think of astronomy, and I certainly don’t think of the leftover radiation from the big bang (known as the cosmic microwave background)! But somebody over at the European Southern Observatory put these two…

So, what’s the deal with this one? startswithabang.com reader Scott Stuart asks the following question: I was reading “The First Three Minutes” last night and came across an interesting section about blackbody radiation and energy density. The author states that as the universe expands, the number of photons running around (in the CMB, for example)…