Dark Energy

Category archives for Dark Energy

“Dark matter is interesting. Basically, the Universe is heavier than it should be. There’s whole swathes of stuff we can’t account for.” -Talulah Riley One of the most puzzling facts about the Universe is that 95% of the energy in it, in the forms of dark matter and dark energy, are completely invisible, and have…

“The more clearly we can focus our attention on the wonders and realities of the universe about us, the less taste we shall have for destruction.” -Rachel Carson The idea that the spatial fabric of the Universe itself is expanding, and that’s what’s behind the observed relationship between redshift and distance has long been controversial,…

“There will be days when we lose faith. Days when our allies turn against us…but the day will never come that we forsake this planet and its people.” ―Optimus Prime There was too much to simply keep it to a single article a day this week here at Starts With A Bang! The dynamic duo of Megan…

“For although it is certainly true that quantitative measurements are of great importance, it is a grave error to suppose that the whole of experimental physics can be brought under this heading.” -Hendrik Casimir Ever since we first discovered that the expansion of the Universe is accelerating, scientists have puzzles as to what’s causing it.…

“If you’re puzzled by what dark energy is, you’re in good company.” -Saul Perlmutter We normally assume that the fundamental constants of the Universe are actually constant, but they don’t have to be that way. They could vary in space, in time, or with the energy density of the Universe, in principle. Before believing in…

“It’s everywhere, really. It’s between the galaxies. It is in this room. We believe that everywhere that you have space, empty space, that you cannot avoid having some of this dark energy.” -Adam Riess Have you heard about the accelerating Universe? What about dark energy, vacuum energy, or a cosmological constant? These are terms we…

“Losing an illusion makes you wiser than finding a truth.” -Ludwig Borne Every so often, an idea comes up in physics claiming that perhaps dark energy isn’t real. The ideas focus on one of two lines of thought: either they discount the observational evidence, or they attempt to show that all the calculations are fundamentally…

“The history of astronomy is a history of receding horizons.” -Edwin Hubble As you look to greater and greater distances, you’re looking back in time in the Universe. But thanks to dark energy, what we can see and access today isn’t always going to be accessible. As galaxies grow more distant with the accelerated expansion…

“It’s the gravity that shapes the large scale structure of the universe, even though it is the weakest of four categories of forces.” -Stephen Hawking Galaxies don’t just exist in isolation in our Universe, but are often found bound together as a part of even grander structures. Our own Milky Way is bound in a…

“In the far, far future, essentially all matter will have returned to energy. But because of the enormous expansion of space, this energy will be spread so thinly that it will hardly ever convert back to even the lightest particles of matter. Instead, a faint mist of light will fall for eternity through an ever…