The experiments were carried out by Thomas Udem from the Max-Planck Institute for Quantum Optics in Garching and colleagues. Udem and colleagues placed four atomic clocks – one rubidium clock, two caesium clocks and a hydrogen maser – in an air conditioned basement at Wessling in Germany and recorded their time difference every 4 seconds […]
Confirmation that the universe is flat – expanding at just the right rate not to collapse – came from measurements of ripples in the cosmic background radiation left over from the big bang. Gamma-ray bursts have been one of the hottest topics in astrophysics in the 1990s and earlier this year astronomers found that a […]
Light from the planet is almost completely obliterated by the bright glare from the star. Although the reflected signal is 10-20,000 times weaker than the glare from tau Bootis, the planet studied by Cameron and co-workers is still the brightest and hottest planet among the extra-solar planets discovered so far. It also has one of […]
In quantum teleportation the quantum state of an object held by “Alice” is instantaneously sent to “Bob”. The new technique works by having two optical cavities that both contain a single trapped atom with three energy levels – two ground states and one excited state. The cavities are designed so that the photon emitted when […]
NASA’s Mission Control Center hoped that the Deep Space Two micoprobe had landed safely and gone into a ‘sleep’ safety mode. But all attempts to contact the probes have failed. During re-entry the spacecraft had to break communications with Earth, which means that no information about the probes’ final moments exist. However, researchers at NASA […]
The JIF scheme is funded by the UK government and the Wellcome Trust, the world’s largest biomedical research charity. It was set up after several reports found that a shortage of state-of-the-art research equipment was making it difficult for universities in the UK to remain at the forefront of international research. Nearly £320m has been […]
XMM will be in a highly elliptical orbit to keep it away from interference caused by the Sun’s glare. The telescope’s large size and unusual orbit explains why XMM was launched from Ariane 5, which is the largest heavy-lift vehicle currently in service. XMM consists of three advanced X-ray telescopes. They each contain 58 high-precision […]
In a series of interviews with a wide cross-section of students who remained in the physics programme, Booth and Ingerman discovered that many students could not adequately explain the links between the basic maths courses and the more advanced physics modules – for example, between Fourier analysis and electromagnetism. They explain that students do not […]
Physics in the 20th century is founded on the twin pillars of quantum mechanics and the theory of relativity. However, in spite of the enormous successes of each theory individually, the two appear to be incompatible. This embarrassing contradiction at the very heart of theoretical physics remains one of the great outstanding challenges in science. […]
Read article: Quantum gravity presents the ultimate challenge to theorists
Quantum mechanics is the most accurate theory we have to describe the world, but there is still much about it that we do not fully understand
Read article: Quantum theory: weird and wonderful
