A fifth force may exist that disrupts the predictions general relativity makes outside our own galaxy, on cosmic-length scales. University of Pennsylvania astrophysicist, Bhuvnesh Jain, says the nature of gravity is the question of a lifetime. As scientists have been able to see farther and deeper into the universe, the laws of gravity have been revealed to be under the influence of an unexplained force.
Continue reading ""Unknown Force May Alter Gravity at Cosmologically Large Scales" (Today's Most Popular)" »
"If there is sufficient energy pumped into Titan's atmosphere and surface from the sun, then it is possible that this would this would spawn evolution of life forms that take advantage of the energy source," said Howard Zebker, Professor of Geophysics and Electrical Engineering at Stanford University. "It would be very different life than on Earth, as it is minus 292 degrees Fahrenheit most of the time. Still, Titan remains one of the best places for life to evolve in the solar system."
Continue reading ""Energy from Sun Could Spawn Evolution of Life Forms on Titan" --NASA/Cassini Scientists" »
It has been a decade since a robotic traveler from Earth first soared over rings of ice and fired its engine to fall forever into the embrace of Saturn. On June 30, the Cassini mission will celebrate 10 years of exploring the planet, its rings and moons.
Continue reading " Cassini Mission's 10-Year Saturn Probe Discoveries Celebrated --"From Titan's Earth-like World to the Mystery of the Giant Hexagon"" »
Nearly 100 years since Albert Einstein developed general relativity, the theory has passed its toughest test yet in explaining the properties of observable Universe. Refuting recent cosmological speculation that gravity "is an illusion" (see below), the most precise measurements to date of the strength of gravitational interactions between distant galaxies show perfect consistency with general relativity’s predictions.
Continue reading ""Gravity is Driving Growth of the Universe" --Astronomers Confirm via 600,000 Galaxies" »
The Antarctic continental ice cap came into existence during the Oligocene epoch, some 33.6 million years ago, according to data from a 2013 international expedition led by the Andalusian Institute of Earth Sciences (IACT)—a Spanish National Research Council-University of Granada joint center. Before the ice covered Antarctica, the Earth was a warm place with a tropical climate. In this region, plankton diversity was high until glaciation 33.6 million years ago reduced the populations leaving only those capable of surviving in the new climate.
Continue reading "Fossil Discovery Shows The Antarctic Icecap is 33.6 million Years Old (Today's Most Popular)" »
3,500 million years ago the Martian crater Gale, through which the NASA rover Curiosity is currently traversing, was covered with glaciers, mainly over its central mound shortly after it was created by the impact of a huge meteorite 3,600 million years ago. Very cold liquid water also flowed through its rivers and lakes on the lower-lying areas, forming landscapes similar to those which can be found in Iceland or Alaska.
Continue reading "NASA's Curiosity Explores Mars' Once Glacier-Covered Area of Gale Crater " »
If you want to confirm the existence of gravitational waves, space-time ripples predicted by Albert Einstein in his theory of general relativity, or want to determine to what extent the law of gravity on the macroscopic scale, as described by Sir Isaac Newton, continues to apply at the microscopic scale, you need to detect and measure forces and motions that are almost incomprehensively tiny. For example, at the Laser Interferometer Gravitational-Wave Observatory (LIGO), scientists are attempting to record motions as small as one thousandth the diameter of a proton.
Continue reading "Force Needed to Measure Gravitational Waves Detected for 1st Time --"Small as One Thousandth the Diameter of a Proton"" »
The hunt for dark matter has taken another step forward thanks to new supercomputer simulations showing the evolution of our "local Universe" from the Big Bang to the present day. Physicists say their simulations could improve understanding of dark matter, the mysterious substance believed to make up 85 per cent of the mass of the Universe.
Continue reading "Galaxy Halos --"Hold Clues to Solving the Mystery of Dark Matter"" »
The discovery of three closely orbiting supermassive black holes in a galaxy more than four billion light years away could help astronomers in the search for gravitational waves: the 'ripples in spacetime' predicted by Einstein. At this point, very little is actually known about black hole systems that are so close to one another that they emit detectable gravitational waves.
Continue reading "Three Orbiting Supermassive Black Holes Will Help Detect Long-Sought Gravity Waves--The Elusive 'Ripples' in Spacetime " »
A mysterious X-ray signal has been found in a detailed study of galaxy clusters using NASA’s Chandra X-ray Observatory and ESA’s XMM-Newton. One intriguing possibility is that the X-rays are produced by the decay of sterile neutrinos, a type of particle that has been proposed as a candidate for dark matter. While holding exciting potential, these results must be confirmed with additional data to rule out other explanations and determine whether it is plausible that dark matter has been observed.
Continue reading "Signal from Unknown Source in Perseus Galaxy Baffles NASA --Suspect Dark Matter Origin" »