NASA managers say the WFIRST mission, the next in the agency’s line of powerful observatories after the Hubble and James Webb telescopes, could cost around $3.2 billion after budgeting for a novel first-of-its-kind instrument to probe the make-up of planets around nearby stars and a bigger-than-expected launch vehicle.
Emergent gravity is a new theory that might explain the curious motions of stars in galaxies. It predicts the exact same deviation of motions that is usually explained by invoking dark matter. Professor Erik Verlinde, renowned expert in string theory, publishes a new research paper today in which he expands his groundbreaking views on the nature of gravity.
Five years ago, the Nobel Prize in Physics was awarded to three astronomers for their discovery, in the late 1990s, that the universe is expanding at an accelerating pace. Now, a team of scientists led by Professor Subir Sarkar of Oxford University’s Department of Physics has cast doubt on this standard cosmological concept.
Researchers who are looking for new ways to probe the nature of gravity and dark energy in the universe have adopted a new strategy: looking at what’s not there. An international team of astronomers were able to achieve four times better precision in measurements of how the universe’s visible matter is clustered together by studying the empty spaces in between.
Hundreds of scientists from the Sloan Digital Sky Survey III (SDSS-III) collaborated to make the largest-ever, three-dimensional map of distant galaxies. The astronomers then used this map to make one of the most precise measurements yet of the dark energy currently driving the accelerated expansion of the universe.
When Edwin Hubble discovered nearly 100 years ago that the universe was uniformly expanding in all directions, the finding was a big surprise. Then, in the mid-1990s, another shocker occurred: astronomers found that the expansion rate was accelerating, perhaps due to “dark energy.” Now, the latest measurements of our runaway universe suggest that it is expanding faster than astronomers thought.
Using data from the 8.2-metre Subaru Telescope, an international team led by Japanese researchers has made a 3-D map of 3,000 galaxies 13 billion light-years from Earth. Based on this comprehensive survey — the first such study at this great distance — the team was able to confirm that Einstein’s general theory of relativity is still valid.
On the largest scales, galaxies and everything they contain are concentrated into filaments that stretch around the edge of enormous voids. Data from the Illustris project, a large computer simulation of the evolution and formation of galaxies, suggests that the black holes at the centre of every galaxy are helping to send matter into the loneliest places in the universe.