Astrophysics

Science

If photons have no mass, how can black holes gravitationally affect them? How can the huge gravity of a galaxy cluster bend their paths?

Stars

Astronomers discover pulsations from crystalized dying star

Cosmology, Galaxies

Cosmic giants shed new light on dark matter

Exoplanets, Planets

Stars don’t obliterate their planets — very often

Exotic Objects, Stars

Astronomers discover light echo from supernova

Robotic Spaceflight, Stars

Hubble maps 3-D structure of ejected material around erupting star

Exotic Objects, Stars

Swift reveals new phenomenon in a neutron star

Stars

Low-sodium diet key to old age for stars

Galaxies

Galaxies fed by funnels of fuel

Science

If all photons have the same speed (the speed of light) and the same mass (zero), why does an individual gamma-ray photon have more energy than a radio-wave photon?

Deep-Sky Objects, Robotic Spaceflight, Stars

Hubble Space Telescope reveals the Ring Nebula’s true shape

Exotic Objects

A hidden population of exotic neutron stars