This NASA/ESA Hubble Space Telescope image offers us the chance to see a distant galaxy now some 19.5 billion light-years ...

The discovery in 1998 that the Universe is expanding faster over time shook the foundations of cosmology. This finding ...

In this image, the NASA/ESA Hubble Space Telescope peers into the spiral galaxy NGC 1317 in the constellation Fornax, located ...

Near a black hole's event horizon, however, the intense gravitational field prevents such annihilation. Instead, the pair is separated: one particle, one carrying negative energy, falls into the ...

This NASA/ESA Hubble Space Telescope image features a sparkling cloudscape from one of the Milky Way's galactic neighbors, a dwarf galaxy called the Large Magellanic Cloud. Located 160,000 light ...

Relic gravitational waves from the early universe span 30 orders of magnitude, from attohertz to gigahertz. Their wavelengths are constrained from above by the Hubble radius, setting a lower frequency ...