Some 45 light years from Earth, the galaxy NGC 4051 was discovered in the constellation Ursa Major by John Herschel in 1788. It is part of a spiral-rich subset of the Virgo supercluster of galaxies that includes the Milky Way. Classified as a Seyfert galaxy, NGC 4051 hosts a supermassive black hole in its core with 1.7 million times the mass of the Sun. Multiple supernovae blasts have been observed in the galaxy over the past several decades, the first in 1983 and the most recent in 2010 when the core of a massive star that had already lost its outer layers of hydrogen and helium exploded in a type 1c supernova. Such explosions are sometimes referred to as stripped core-collapse supernovae. This beautifully rendered view of NGC 4051 was captured by the Hubble Space Telescope.
The ghostly shells of galaxy ESO 381-12 are captured here in a new image from the NASA/ESA Hubble Space Telescope, set against a backdrop of distant galaxies. Some 270 million light-years from Earth in the constellation of Centaurus, ESO 381-12 is categorised as a lenticular galaxy — a hybrid type that shares properties with both spiral and elliptical galaxies.
The Hubble Space Telescope imaged a distant cluster of galaxies that was found by ESA’s Planck satellite, which detected distortions in the cosmic background radiation caused by the cluster’s gravity. Some five billion light years from Earth, the cluster’s members appear as a swarm of red-shifted galaxies, along with an arc of bluish light caused by gravitational lensing.
Combining images taken with the NASA/ESA Hubble Space Telescope over more than 20 years, a team of researchers has discovered that Eta Carinae, a very massive star system that has puzzled astronomers since it erupted in a supernova-like event in the mid-19th century, has a past that’s much more violent than they thought.