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Home of Astrophotography - AstroBin
AstroBin is an image hosting website specifically targeted to astrophotographers: it's the first and the last place where you need to upload your astrophotography images. Made by an astrophotographer, for the astrophotographers.
space  science  research  photography  photos  photo  pictures  galaxy  universe  planet  planets 
4 days ago by msszczep
media.ccc.de - Let's reverse engineer the Universe
There is four times more dark matter and over fifteen times more dark energy than regular matter in the universe. And we have absolutely ...
awesometalks  35c3  congress  universe  physics  darkmatter 
4 weeks ago by bitboxer
Seth Fletcher, "How Do You Take a Picture of a Black Hole? With a Telescope as Big as the Earth," The New York Times
The edge of a black hole is an ideal place to test the theory of general relativity, which scientists have been trying for the last century to break.
astronomy  NYT  BlackHoles  universe  science  SethFletcher  2018Faves 
6 weeks ago by briansholis
Bizarre 'dark fluid' with negative mass could dominate the universe – what my research suggests • The Conversation
Jamie Farnes is a research associate and astrophysicist at the University of Oxford's e-Research Centre:
<p>Negative masses are a hypothetical form of matter that would have a type of negative gravity – repelling all other material around them. Unlike familiar positive mass matter, if a negative mass was pushed, it would accelerate towards you rather than away from you.

Negative masses are not a new idea in cosmology. Just like normal matter, negative mass particles would become more spread out as the universe expands – meaning that their repulsive force would become weaker over time. However, studies have shown that the force driving the accelerating expansion of the universe is relentlessly constant. This inconsistency has previously led researchers to abandon this idea. If a dark fluid exists, it should not thin out over time.

In the new study, I propose a modification to Einstein’s theory of general relativity to allow negative masses to not only exist, but to be created continuously. “Matter creation” was already included in an early alternative theory to the Big Bang, known as the Steady State model. The main assumption was that (positive mass) matter was continuously created to replenish material as the universe expands. We now know from observational evidence that this is incorrect. However, that doesn’t mean that negative mass matter can’t be continuously created. I show that this assumed dark fluid is never spread too thinly. Instead it behaves exactly like dark energy.</p>

Well, at least it gives you something to talk about at parties.
energy  history  einstein  universe 
11 weeks ago by charlesarthur

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