Video Credit: ESO
Meanwhile, at the Galaxy’s Center …
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Tag Archives: ESO
The Fornax Dwarf
The Fornax Dwarf Spheroidal is an elliptical dwarf galaxy found in the constellation Fornax. The galaxy is a satellite of the Milky Way and is receding from the us at 53 km/s. It contains six know globular star clusters, an unusually large number for such a small galaxy. Four of them (Fornax 1, 2, 3, and 5) are pictured below.
Image Credits: ESO and ESA
Supernova SN2021afdx
Video Credits: NASA / ESA / CSA / STScI / Webb ERO Production Team
An Extragalactic Black Hole
Video Credit: ESO
Zooming in on VFTS 243
From our galaxy into the Large Magellanic Cloud …
Video Credit: ESO
A Galaxy with Extra Arms
Seen in visible light and infrared, the galaxy known as M106 a a garden-variety spiral galaxy, but when it’s viewed at radio frequencies (purple) and x-rays (blue), additional arms appear. These are jets powered by matter falling into a massive black hole.
Image Credit: NASA
Three Ways of Seeing the Tarantula Nebula
This short video crossfades down the electromagnetic spectrum from visible light (ESO’s 2.2 m Telescope), infrared (ESO’s VLT and VISTA), and radio (ESO’s ALMA). The Tarantula Nebula (aka 30 Doradus) is a part of the Large Magellanic Cloud.
Video Credit: ESA
A Cluster of Galaxies
Named for the southern constellation in whose part of the sky most of its galaxies can be found, the Fornax Cluster is one of the closest clusters of galaxies. At an average of 62 million light-years away, it is almost 20 times more distant than the nearby Andromeda Galaxy. Almost every yellow blob in this two-degree-wide image is an elliptical galaxy in the cluster. The barred spiral galaxy NGC 1365 that stands out in the lower right is a member of the cluster.
Image Credit: ESO
Sharpless 2-274
ESO’s Very Large Telescope in Chile captured this image of the Medusa Nebula (also known Abell 21 and Sharpless 2-274). As the star at the heart of this nebula made its final transition into the final stage of its existence, it blew off its outer layers into space, forming this colorful cloud. The Sun will go through a similar process in a few billion years.
Image Credit: ESO
The Needle’s Eye
NGC 247 (aka Caldwell 62) is a dwarf spiral galaxy. It’s called the Needle’s Eye because of an unusually large void on one side of its spiral disk. This void contains some older, redder stars but no younger, bluer stars.
Image Credit: ESO
Imaging A Black Hole
Video Credit: ESO
Micronovae
Video Credit: ESO
Climate Change on Neptune
These thermal images taken from Neptune were taken with the VISIR instrument on ESO’s Very Large Telescope. Taken between 2006 and 2021, they show Neptune gradually cooling down, followed by a dramatic heating of its south pole in the last few years. From 2003 to 2018 Neptune’s average temperature dropped about 8 °C, and over the next three years it spiked 11 °C hotter.
Video Credit: ESO
Doing Science
Video Credit: ESO
Dimethyl Ether and IRS 48
Video Cedit: ESO
Messier 77’s Black Hole
Video Credit: ESO
A Herbig-Haro Object
This picture was assembled from combined observations from NASA’s Spitzer Space Telescope and ESO’s Atacama Large Millimeter/submillimeter Array (ALMA) in Chile. It reveals the throes of stellar birth in an object known as HH 46/47.
HH or Herbig-Haro objects form when particle jets shot out by newborn stars collide with surrounding matter, producing small, bright, nebulous regions. The dynamics within many HH objects are obscured from observation with visible light by the enveloping gas and dust, but the infrared and submillimeter light seen by Spitzer and ALMA, respectively, cuts through the cloud around HH 46/47. (Infrared light has longer wavelengths than what we see with our eyes, and submillimeter wavelengths are longer still.)
In this false-color image the shorter-wavelength light appears blue and longer-wavelength light, red. Blue shows gas energized by the outflowing jets. Green traces a combination of hydrogen gas molecules and dust that follows the boundary of the gas cloud surrounding the young star. The red areas are excited carbon monoxide gas.
Image Credit: NASA / ESO
A Barred Spiral Galaxy
This is the spiral galaxy NGC 986 in the constellation of Fornax (The Furnace). The galaxy is about 56 million light-years away, and we see it almost perfectly face-on from Earth, allowing us to see the two main spiral arms and also a central bar-shaped structure, composed of stars and dust, which makes it a barred spiral galaxy.
Image Credit: ESO
A Galaxy on Edge
NGC 4565 is sometimes called the Needle Galaxy. It’s an edge-on spiral galaxy located about 30 million light-years away in the constellation Coma Berenices (Berenice’s Hair). Its bright yellowish central bulge juts out above impressive dust lanes.
Image Credit: ESO
A Gap in the Stars?
Some of the stars appear to be missing, but the black gap in this starfield is not really a hole. It’s a region clogged with gas and dust. This dark cloud is called Lynds Dark Nebula 483 0r LDN 483. Clouds such as this are the birthplaces of future stars.
LDN 483 is about 700 light-years away in the constellation of Serpens (The Serpent). The cloud contains enough dusty material to completely block the visible light from background stars. Such a dense molecular cloud qualifies as a dark nebulae because of this obscuring property. One might think that the starless nature of a cloud like LDN 483 would suggest that it’s not a place where stars can take root and grow. The opposite is true: dark nebulae offer the most fertile environments for eventual star formation.
Studies of star formation in LDN 483 have discovered some of the youngest observable kinds of baby stars hidden in LDN 483. These gestating stars can be thought of as still being in the womb, having not yet been born as immature stars. In this first stage of stellar development, the star-to-be is just a clump of gas and dust contracting under the force of gravity within the surrounding molecular cloud. The protostar is still quite cool. At about -250°C they are colder than liquid oxygen on the Earth’s surface, and they “shine” only in long-wavelength submillimetrer light. Still, temperature and pressure are beginning to increase in the fledgling star’s core.
This earliest period of star growth lasts for a few thousands of years, an very short amount of time in astronomical terms.Stars typically live for millions or billions of years. Over the course of several million years, the protostar will grow warmer and denser. Its emission will increase, graduating from mainly cold, far-infrared light to near-infrared and finally to visible light. The once-dim protostar will have then become a fully luminous star.
As more and more stars emerge from LDN 483, the dark nebula will disperse and lose its opacity. Finally, the missing background stars that are currently hidden will then come into view, but they will be outshone by the bright young-born stars in the cloud.
Image Credit: ESO
The Flame Nebula
This brief video show the Flame Nebula and its surrounding as seen in visible light, infrared, and radio.
Video Credit: ESO
Rogue Planets
Video Credit: ESO
Stars Near the Center of Our Galaxy
Video Credit: ESO
A Surprising Exoplanet
Video Credit: ESO
Zooming in on a Pair of Black Holes
NGC 7727 is a galaxy with two centeral nuclei, each on with its own black hole.
Video Credit: ESO