Gravitational hunt for extra dimensions
If extra dimensions are large, part of the gravitational field would “leak” into the extra dimensions and gravitational waves would be weaker than expected.
Particle interactions up to the highest energies
The 20th International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2018) was held in Nagoya, Japan.
Solving the mystery of a historic stellar blast
Some 180 years ago, a relatively normal star called Eta Carinae suddenly brightened to become the second brightest star in the sky, before almost disappearing at the end of the 19th century.
Elephants in the gamma-ray sky
The discovery of large-scale features in the gamma-ray sky in approximately the same direction continues to puzzle researchers.
Relativity passes test on a galactic scale
Gravity behaves the same way on a galactic scale as it does in our solar system, and alternative gravity models which remove the need for dark energy are disfavoured.
Black holes galore at galactic core
For decades, theoretical models of galaxy evolution have predicted that the supermassive black hole lying at the heart of the Milky Way is surrounded by thousands of smaller black holes left behind by...
HESS proves the power of TeV astronomy
For hundreds of years, discoveries in astronomy were all made in the visible part of the electromagnetic spectrum. This changed in the past century when new objects started being discovered at both lo...
Hubble expansion discrepancy deepens
In the 1920s, Edwin Hubble discovered that the universe is expanding by showing that more distant galaxies recede faster from Earth than nearby ones. Hubble’s measurements of the expansion rate, now...
Spotting the first extragalactic planets
Three decades since astronomers first detected planets outside our solar system, exoplanets are now being discovered at a rate of hundreds per year. Although it is reasonable to assume other galaxies ...
Europe defines astroparticle strategy
Multi-messenger astronomy, neutrino physics and dark matter are among several topics set to take priority in Europe, according to a report by the Astroparticle Physics European Consortium (APPEC).
