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The constellation of Ursa Major (The Great Bear) homw to the dwarf galaxy NGC 5477.

The constellation of Ursa Major (The Great Bear) homw to the dwarf galaxy NGC 5477.

What are Dwarf Galaxies?

August 22, 2022

Although they can contain billions of stars, dwarf galaxies are nevertheless just a fraction of the size of Milky Way.

James Webb spots the oldest, farthest galaxy humanity has ever seen

by Alexandru Micu

The telescope is already making incredible discoveries just one week after its debut image.

Almost two billion stars: Largest, most detailed star catalog to date revealed

by Mihai Andrei

The European Space Agency released its treasure trove of stars.

Astronomers have pegged the farthest galaxy ever discovered

by Jordan Strickler

HD1 bests the rest.

The subject of this image is a group of three galaxies, collectively known as NGC 7764A. They were imaged by the NASA/ESA Hubble Space Telescope, using both its Advanced Camera for Surveys (ACS) and Wide Field Camera 3 (WFC3). The two galaxies in the upper right of the image appear to be interacting with one another — indeed, the long trails of stars and gas extending from them both give the impression that they have both just been struck at great speed, thrown into disarray by the bowling-ball-shaped galaxy to the lower left of the image. In reality, however, interactions between galaxies happen over very long time periods, and galaxies rarely collide head-on with one another. It is also unclear whether the galaxy to the lower left is actually interacting with the other two, although they are so relatively close in space that it seems possible that they are. By happy coincidence, the collective interaction between these galaxies have caused the two on the upper right to form a shape, which from our Solar System's perspective, ressembles the starship known as the USS Enterprise from Star Trek! NGC 7764A, which lies about 425 million light years from Earth in the constellation Phoenix, is a fascinating example of just how awkward astronomical nomenclature can be. The three galaxies are individually referred to as NGC 7764A1, NGC 7764A2 and NGC 7764A3, and just to be really difficult, an entirely separate galaxy, named NGC 7764, sits in the skies about a Moon’s distance (as seen from Earth) away. This rather haphazard naming makes more sense when we consider that many of the catalogues for keeping track of celestial bodies were compiled well over 100 years ago, long before modern technology made standardising scientific terminology much easier. As it is, many astronomical objects have several different names, or might have names that are so similar to other objects’ names that they cause confusion.

The subject of this image is a group of three galaxies, collectively known as NGC 7764A. They were imaged by the NASA/ESA Hubble Space Telescope, using both its Advanced Camera for Surveys (ACS) and Wide Field Camera 3 (WFC3). The two galaxies in the upper right of the image appear to be interacting with one another — indeed, the long trails of stars and gas extending from them both give the impression that they have both just been struck at great speed, thrown into disarray by the bowling-ball-shaped galaxy to the lower left of the image. In reality, however, interactions between galaxies happen over very long time periods, and galaxies rarely collide head-on with one another. It is also unclear whether the galaxy to the lower left is actually interacting with the other two, although they are so relatively close in space that it seems possible that they are. By happy coincidence, the collective interaction between these galaxies have caused the two on the upper right to form a shape, which from our Solar System's perspective, ressembles the starship known as the USS Enterprise from Star Trek! NGC 7764A, which lies about 425 million light years from Earth in the constellation Phoenix, is a fascinating example of just how awkward astronomical nomenclature can be. The three galaxies are individually referred to as NGC 7764A1, NGC 7764A2 and NGC 7764A3, and just to be really difficult, an entirely separate galaxy, named NGC 7764, sits in the skies about a Moon’s distance (as seen from Earth) away. This rather haphazard naming makes more sense when we consider that many of the catalogues for keeping track of celestial bodies were compiled well over 100 years ago, long before modern technology made standardising scientific terminology much easier. As it is, many astronomical objects have several different names, or might have names that are so similar to other objects’ names that they cause confusion.

Hubble spots three galaxies dancing in epic photo

by Mihai Andrei

February 2, 2022

Hubble may have spotted a very rare phenomenon.

Hubble spots black hole “giving birth” to new star

by Mihai Andrei

January 24, 2022

Black holes may do more than just destroy -- they may also create new things.

This artist’s impression shows NGP–190387, a star-forming, dusty galaxy that is so far away its light has taken over 12 billion years to reach us. ALMA observations have revealed the presence of fluorine in the gas clouds of NGP–190387. To date, this is the most distant detection of the element in a star-forming galaxy, one that we see as it was only 1.4 billion years after the Big Bang — about 10% of the current age of the Universe. The discovery sheds a new light on how stars forge fluorine, suggesting short-lived stars known as Wolf–Rayet are its most likely birthplace.

This artist’s impression shows NGP–190387, a star-forming, dusty galaxy that is so far away its light has taken over 12 billion years to reach us. ALMA observations have revealed the presence of fluorine in the gas clouds of NGP–190387. To date, this is the most distant detection of the element in a star-forming galaxy, one that we see as it was only 1.4 billion years after the Big Bang — about 10% of the current age of the Universe. The discovery sheds a new light on how stars forge fluorine, suggesting short-lived stars known as Wolf–Rayet are its most likely birthplace.

Astronomers find the farthest evidence of fluoride to date, in a distant galaxy

by Alexandru Micu

November 4, 2021

This will teach us a lot about how the element forms in the Universe.

NASA just added three more sonification projects to their page and I couldn’t be more delighted

by Alexandru Micu

The subdued, mysterious, and longing tunes sound very appropriate for outer space.

Recent discoveries have challenged ideas about how galaxies form, including how early in the Universe's history they developed.

Recent discoveries have challenged ideas about how galaxies form, including how early in the Universe's history they developed.

What’s My Age Again? New Discoveries May Spark a Rethink of Galaxy Formation

A trifecta of recent discoveries has challenged models of galactic evolution, suggesting that galaxies could have formed much sooner in ...

The Milky Way’s halo might be thousands of times hotter than the sun’s surface

by Jordan Strickler

The halo surrounding the Milky Way may be much hotter than originally thought.

Hubble’s spectacular new image of the Umbrella Galaxy will help make your quarantine prettier

by Alexandru Micu

Things are pretty stressful on Earth right now -- so look at the sky!

Astronomers find the most massive black hole in the local universe

December 4, 2019

A dim patch in an otherwise bright galaxy is the epicenter of a supermassive black hole whose mass is 40 ...

Physicists perform the most detailed simulation of the Universe yet

November 20, 2019

This immense simulation is so complex that scientists have observed phenomena that had not been programmed explicitly in the code.

We know something more about dark energy: it isn’t a fundamental force

by Mihai Andrei

August 28, 2019

We still don't know what dark energy *is*, but we found out another thing it isn't.

Credit: Pixabay.

Credit: Pixabay.

The Milky Way once devoured a dwarf galaxy 10 billion years ago

The study might help scientists understand how galaxies evolve.

This deep-field view of the sky (center) taken by NASA's Hubble and Spitzer space telescopes is dominated by galaxies - including some very faint, very distant ones - circled in red. The bottom right inset shows the light collected from one of those galaxies during a long-duration observation.Credit: NASA/JPL-Caltech/ESA/Spitzer/P. Oesch/S. De Barros/I.Labbe

This deep-field view of the sky (center) taken by NASA's Hubble and Spitzer space telescopes is dominated by galaxies - including some very faint, very distant ones - circled in red. The bottom right inset shows the light collected from one of those galaxies during a long-duration observation.Credit: NASA/JPL-Caltech/ESA/Spitzer/P. Oesch/S. De Barros/I.Labbe

Bright galaxies help solve mystery about early universe

by Mihai Andrei

They were much brighter than they were supposed to be.

Artist impression of a warped Milky Way. Credit: CHEN Xiaodian.

Artist impression of a warped Milky Way. Credit: CHEN Xiaodian.

The Milky Way’s outer disk may actually be warped and twisted

February 4, 2019

Torque is warping the galaxy's outer disk in an S-shape.

The blue circles surround the brighter satellites, the white circles the ultrafaint satellites (so faint that they are not readily visible in the image). The ultrafaint satellites are amongst the most ancient galaxies in the Universe; they began to form when the Universe was only about 100 million years old (compared to its current age of 13.8 billion years). The image has been generated from simulations from the Auriga project. Image credits: Institute for Computational Cosmology, Durham University, UK/ Heidelberg Institute for Theoretical Studies, Germany / Max Planck Institute for Astrophysics, Germany.

The blue circles surround the brighter satellites, the white circles the ultrafaint satellites (so faint that they are not readily visible in the image). The ultrafaint satellites are amongst the most ancient galaxies in the Universe; they began to form when the Universe was only about 100 million years old (compared to its current age of 13.8 billion years). The image has been generated from simulations from the Auriga project. Image credits: Institute for Computational Cosmology, Durham University, UK/ Heidelberg Institute for Theoretical Studies, Germany / Max Planck Institute for Astrophysics, Germany.

Ancient galaxies found in our cosmic neighborhood

by Mihai Andrei

August 20, 2018

The galaxies date from the so-called cosmic Dark Ages.

Andromeda Galaxy.

Andromeda Galaxy.

Two billion years ago, Andromeda ‘ate’ a sister-galaxy of the Milky Way

by Alexandru Micu

The findings could topple our current understanding of how galaxies merge.

Okay, one, two, three...
Image credits: Hubble.

Okay, one, two, three...
Image credits: Hubble.

How many galaxies are there?

by Mihai Andrei

January 28, 2021

Talk about a big count!

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