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.
Britain granted its first license for human cloning Wednesday, more than three years after becoming the first nation to authorize the technique to produce stem cells for medical research.
A team of researchers at Newcastle University hope eventually to create insulin-producing cells that could be transplanted into diabetic patients.
Britain became the first country to authorize the cloning of human embryos when Parliament voted in 2001 to allow regulators to license the method to scientists investigating the medical promise of stem cells, the master cells of the body.