Hubble view of green filament in galaxy UGC 7342: This new NASA/ESA Hubble Space Telescope image shows ghostly green filaments, lying within galaxy UGC 7342. This filament was illuminated by a blast of radiation from a quasar — a very luminous and compact region that surrounds the supermassive black hole at the centre of its host galaxy. Its bright green hue is a result of ionised oxygen, which glows brightly at green wavelengths.

Name: UGC 7342
Type: Local Universe : Nebula : Appearance : EmissionLocal Universe : Galaxy : Activity : AGN : Quasar
Category: NebulaeQuasars and Black Holes
Constellation: Coma Berenices
Release date: 2 April 2015, 17:00
Credit: NASA, ESA, W. Keel (University of Alabama, USA)

Hubble view of green filament in galaxy Mrk 1498: This new NASA/ESA Hubble Space Telescope image shows ghostly green filaments, lying within galaxy Mrk 1498. This filament was illuminated by a blast of radiation from a quasar — a very luminous and compact region that surrounds the supermassive black hole at the centre of its host galaxy. Its bright green hue is a result of ionised oxygen, which glows brightly at green wavelengths.

Name: Mrk 1498
Type: Local Universe : Nebula : Appearance : EmissionLocal Universe : Galaxy : Activity : AGN : Quasar
Category: NebulaeQuasars and Black Holes
Constellation: Draco
Release date: 2 April 2015, 17:00
Credit: NASA, ESA, W. Keel (University of Alabama, USA)

Hubble view of green filament in galaxy UGC 11185: This new NASA/ESA Hubble Space Telescope image shows ghostly green filaments, lying within galaxy UGC 11185. This filament was illuminated by a blast of radiation from a quasar — a very luminous and compact region that surrounds the supermassive black hole at the centre of its host galaxy. Its bright green hue is a result of ionised oxygen, which glows brightly at green wavelengths.

Name: UGC 11185
Type: Local Universe : Nebula : Appearance : EmissionLocal Universe : Galaxy : Activity : AGN : Quasar
Category: NebulaeQuasars and Black Holes
Constellation: Lyra
Release date: 2 April 2015, 17:00
Credit: NASA, ESA, W. Keel (University of Alabama, USA)

Hubble view of green filament in galaxy 2MASX J22014163+1151237: This new NASA/ESA Hubble Space Telescope image shows ghostly green filaments, lying within galaxy 2MASX J22014163+1151237. This filament was illuminated by a blast of radiation from a quasar — a very luminous and compact region that surrounds the supermassive black hole at the centre of its host galaxy. Its bright green hue is a result of ionised oxygen, which glows brightly at green wavelengths.

Name: 2MASX J22014163+1151237
Type: Local Universe : Nebula : Appearance : EmissionLocal Universe : Galaxy : Activity : AGN : Quasar
Category: NebulaeQuasars and Black Holes
Constellation: Pegasus
Release date: 2 April 2015, 17:00
Credit: NASA, ESA, W. Keel (University of Alabama, USA)

Elliptical galaxy IC 2006: This NASA/ESA Hubble Space Telescope image shows an elliptical galaxy known as IC 2006. Massive elliptical galaxies like these are common in the modern Universe, but how they quenched their once furious rates of star formation is an astrophysical mystery. Now, the NASA/ESA Hubble Space Telescope and ESO's Very Large Telescope (VLT) have revealed that three billion years after the Big Bang, these types of galaxies still made stars on their outskirts, but no longer in their interiors. The quenching of star formation seems to have started in the cores of the galaxies and then spread to the outer parts.

Name: IC 2006
Type: Local Universe : Galaxy : Type : Elliptical
Category: Galaxies
Constellation: Eridanus
Release date: 16 April 2015, 20:00
Credit: ESA/Hubble & NASA Image acknowledgement: Judy Schmidt and J. Blakeslee (Dominion Astrophysical Observatory). Note that the image is not related to science release content. Science acknowledgement: M. Carollo (ETH, Switzerland)

Galaxies die from the inside out: Star formation in what are now "dead" galaxies sputtered out billions of years ago. ESO’s Very Large Telescope and the NASA/ESA Hubble Space Telescope have revealed that three billion years after the Big Bang, these galaxies still made stars on their outskirts, but no longer in their interiors. The quenching of star formation seems to have started in the cores of the galaxies and then spread to the outer parts. This diagram illustrates this process. Galaxies in the early Universe appear at the left. The blue regions are where star formation is in progress and the red regions are the "dead" regions where only older redder stars remain and there are no more young blue stars being formed. The resulting giant spheroidal galaxies in the modern Universe appear on the right.

Type: Early Universe : Galaxy
Category: Illustrations
Release date: 16 April 2015, 20:00
Credit: ESA/Hubble and ESO

Westerlund 2 — Hubble’s 25th anniversary image: This NASA/ESA Hubble Space Telescope image of the cluster Westerlund 2 and its surroundings has been released to celebrate Hubble’s 25th year in orbit and a quarter of a century of new discoveries, stunning images and outstanding science. The image’s central region, containing the star cluster, blends visible-light data taken by the Advanced Camera for Surveys and near-infrared exposures taken by the Wide Field Camera 3. The surrounding region is composed of visible-light observations taken by the Advanced Camera for Surveys.

Name: Gum 29, RCW 49, Westerlund 2, WR 20a
Type: Milky Way : Star : Grouping : Cluster : OpenMilky Way : Nebula
Category: AnniversaryNebulaeStar Clusters
Constellation: Carina
Distance: 20000 light years
Release date: 23 April 2015, 15:15
Credit: NASA, ESA, the Hubble Heritage Team (STScI/AURA), A. Nota (ESA/STScI), and the Westerlund 2 Science Team The original observations of Westerlund 2 were obtained by the science team: Antonella Nota (ESA/STScI), Elena Sabbi (STScI), Eva Grebel and Peter Zeidler (Astronomisches Rechen-Institut Heidelberg), Monica Tosi (INAF, Osservatorio Astronomico di Bologna), Alceste Bonanos (National Observatory of Athens, Astronomical Institute), Carol Christian (STScI/AURA) and Selma de Mink (University of Amsterdam). Follow-up observations were made by the Hubble Heritage team: Zoltan Levay (STScI), Max Mutchler, Jennifer Mack, Lisa Frattare, Shelly Meyett, Mario Livio, Carol Christian (STScI/AURA), and Keith Noll (NASA/GSFC).

Wide-field image of Westerlund 2 (ground-based image): This image from the Digitized Sky Survey shows star cluster Westerlund 2 and its surroundings. A new image of Westerlund 2 was released to celebrate the 25th anniversary of the NASA/ESA Hubble Space Telescope.

Name: Westerlund 2
Type: Milky Way : Star : Grouping : ClusterMilky Way : Nebula : Appearance : Emission : H II RegionMilky Way : Star : Grouping : Binary
Category: NebulaeStar Clusters
Constellation: Carina
Distance: 20000 light years
Release date: 23 April 2015, 15:15
Credit: NASA, ESA, Digitized Sky Survey 2

The star cluster Westerlund 2: This image shows the sparkling centerpiece of Hubble's 25th anniversary tribute. Westerlund 2 is a giant cluster of about 3000 stars located 20 000 light-years away in the constellation Carina. Hubble's near-infrared imaging camera pierces through the dusty veil enshrouding the stellar nursery, giving astronomers a clear view of the dense concentration of stars in the central cluster.

Name: Westerlund 2
Type: Milky Way : Star : Grouping : ClusterMilky Way : Nebula : Appearance : EmissionMilky Way : Star : Grouping : BinaryMilky Way : Nebula : Type : Star Formation
Category: NebulaeStar Clusters
Constellation: Carina
Distance: 20000 light years
Release date: 23 April 2015, 15:15
Credit: NASA, ESA, the Hubble Heritage Team (STScI/AURA), A. Nota (ESA/STScI), and the Westerlund 2 Science Team