Physicists set strongest limit on mass of dark matter

Brown University physicists have set the strongest limit for the mass of dark matter, the mysterious particles believed to make up nearly a quarter of the universe. The researchers report in Physical Review Letters that dark matter must have a mass greater than 40 giga-electron volts. The distinction is important because it casts doubt on recent results from underground experiments that have reported detecting dark matter.
PROVIDENCE, R.I. [Brown University] — If dark matter exists in the universe, scientists now have set the strongest limit to date on its mass.

Happy birthday Neptuno

While Neptune slogged around the Sun over the last 165 years, a lot has happened on Earth in that span of time. This video chronicles some of the major events that occurred on this planet during a single Neptune orbit.

Via | HubbleSite

Densest Matter Created in Big-Bang Machine

A superhot substance recently made in the Large Hadron Collider (pictures) is the densest form of matter ever observed, scientists announced this week.

Known as a quark-gluon plasma, the primordial state of matter may be what the entire universe was like in the immediate aftermath of the big bang.