Astronomy Knowledge

2023-06-13 21:22:32 Weighing a quasar's galaxy with precision

◉ A team of researchers from EPFL have found a way to use the phenomenon of strong gravitational lensing to determine with precision – about 3 times more precise than any other technique – the mass of a galaxy containing a quasar, as well as their evolution in cosmic time. Knowing the mass of quasar host galaxies provides insight into the evolution of galaxies in the early universe, for building scenarios of galaxy formation and black hole development.
◉ “The masses of host galaxies have been measured in the past, but thanks to gravitational lensing, this is the first time that the measurement is so precise in the distant Universe,” explains Martin Millon, lead author of the study and currently at Stanford University on an SNF grant.

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2023-06-12 17:56:13 Astronomers Double the Number of Known Repeating Fast Radio Bursts

Scientists from the MIT Kavli Institute and others have doubled the known repeating Fast Radio Burst (FRB) sources to 50, as per their study published in The Astrophysical Journal. Using advanced statistical tools and CHIME, the research suggests that all FRBs may eventually repeat, with differing burst durations and frequency ranges, indicating different origins. The study aids in understanding explosive stellar deaths and their aftermaths...Read More ክፈት / አስተያየት ይስጡ

2023-06-11 19:00:39 The longest galactic tail ever seen

Like comets and cats, clusters of galaxies sometimes have long tails.
NASA's Chandra X-ray Observatory discovered around 50 galaxies bound together by gravity — called NGC 4839. This group is merging with the much larger Coma Cluster, a dense stellar formation some 340 million light-years from Earth, which contains over 1,000 tightly-bunched galaxies. 
Researchers tracked NGC 4839 as it moved through the Coma Cluster, leaving a streak of bright, hot gas in its wake — a "tail". The tail was found to be 1.5 million light years long, which is the longest such structure ever observed, according to NASA.

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2023-06-11 18:00:50 How long has it been since you've updated a photo on social media?


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2023-06-10 16:28:21 The brightest gamma-ray burst ever

When scientists detected the gamma-ray burst known as GRB 221009A on Oct. 9, 2022, they dubbed it the brightest of all time, or BOAT. In a study published June 7, in the journal Science Advances, scientists used NuSTAR (Nuclear Spectroscopic Telescope Array) observations of the event to show how the collapsing star ejected a jet of material that had a shape not previously observed among gamma-ray burst jets, as well as other unique characteristics.
GRB 221009A was so bright that it effectively blinded most gamma-ray instruments in space. U.S. scientists were able to reconstruct this event with data from NASA’s Fermi Gamma-ray Space Telescope to determine its actual brightness.

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2023-06-09 22:52:41 Monitoring Activity from Nearby stars with uv Imaging and Spectroscopy (MANTIS) is an  $8.5 million NASA space mission, being developed to aid the Webb telescope in its mission to explore the atmospheres of "exoplanets" beyond Earth's solar system.
This CubeSat, or mini-satellite, will be about the size of a toaster oven and will be designed and built at the Laboratory for Atmospheric and Space Physics (LASP) at the University of Colorado Boulder.
the MANTIS spacecraft will be able to observe the night sky in the full range of ultraviolet light. That includes an especially energetic form of radiation called extreme ultraviolet (EUV) light.

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2023-06-08 19:53:01 Some effects of multiple spaceflights on an astronaut..

Spaceflight experience, in particular longer missions and shorter inter-mission recovery time, induce fluid changes in the brain that may not return to normal before subsequent flights.

Ventricles — cavities in the brain filled with cerebrospinal fluid — expand increasingly with longer spaceflight missions of up to six months, and inter-mission intervals of less than three years may not allow sufficient time for the ventricles to fully recover.

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2023-06-07 21:10:53 ​How artificial photosynthesis may be key to sustained life beyond Earth

Life on Earth owes its existence to photosynthesis—a process which is 2.3 billion years old. This immensely fascinating (and still not fully understood) reaction enables plants and other organisms to harvest sunlight, water and carbon dioxide while converting them into oxygen and energy in the form of sugar.
Photosynthesis is such an integral part of Earth's functioning that we pretty much take it for granted. But as we look beyond our own planet for places to explore and settle on, it is obvious how rare and valuable the process is..Read More ክፈት / አስተያየት ይስጡ

2023-06-06 11:18:06 Astronomers using the Webb telescope discovered evidence of complex organic molecules in a galaxy more than 12 billion light-years away. The galaxy lines up almost perfectly with a second galaxy only 3 billion light-years away from our perspective on Earth. In this false-color Webb image, the foreground galaxy is shown in blue, while the background galaxy is red. The organic molecules are highlighted in orange. ክፈት / አስተያየት ይስጡ

2023-06-05 16:50:03 The NASA/ESA Hubble Space Telescope has captured this striking image of the Jellyfish galaxy JO206, located over 700 million light-years away in the Aquarius constellation. This image marks the final observation in a series dedicated to jellyfish galaxies, named for their distinctive shape, which resembles a jellyfish with trailing tendrils of star formation.

Credit: ESA/Hubble & NASA, M. Gullieuszik and the GASP team ክፈት / አስተያየት ይስጡ