Reports that a group set up as part of the Search for Extraterrestrial Life (SETI) has detected a radio transmission that it suspects could be a signal from an alien civilisation have been dismissed by the organisation.
"Sorry, but there's nothing new to report," said David Anderson, director of SETI@home.
"The candidate signal in question was essentially ruled out as an ET [extra-terrestrial] signal because its Doppler drift rate varied too widely," Anderson told ZDNet UK, adding that this fact had first been reported back in April.
Two Neptune-sized planets have been discovered circling stars beyond our Solar System, US astronomers reported on Tuesday. The discoveries, which come less than a week after a similar announcement by European scientists, hint at a vast new class of extrasolar planet.
A new kind of planet has been discovered in a star system 50 light years away. It is the smallest world to be found outside our Solar System, and probably the first rocky planet found so far, astronomers revealed on Wednesday.
The planet orbits the star mu Arae, which has been monitored by a European team of astronomers using an instrument called HARPS (High Accuracy Radial velocity Planet Searcher), attached to the 3.6-metre telescope at La Silla observatory in Chile.
Physicists have carried out successful teleportation with particles of light over a distance of 600m across the River Danube in Austria.
When physicists say "teleportation", they are describing the transfer of key properties from one particle to another without a physical link. Quantum teleportation relies on an aspect of physics known as "entanglement"; whereby the properties of two particles can be tied together even when they are far apart. Einstein called it "spooky action at a distance".
Cannabis extracts may shrink brain tumours and other cancers by blocking the growth of the blood vessels which feed them, suggests a new study.
An active component of the street drug has previously been shown to improve brain tumours in rats. But now Manuel Guzman at Complutense University, Spain, and colleagues have demonstrated how the cannabis extracts block a key chemical needed for tumours to sprout blood vessels – a process called angiogenesis.