Team led by UChicago scientist Wendy Freedman using James Webb Space Telescope finds no evidence of tension in Hubble Constant
Category: space – Page 12
Spectroscopic study inspects blue straggler stars in NGC 3201
Using the Magellan Clay Telescope, astronomers have performed a spectroscopic study of blue straggler stars in the globular cluster NGC 3201. Results of the new study, published May 21 on the arXiv preprint server, could help us better understand the properties and chemical composition of this cluster.
First identified in the 1950s, the blue straggler stars (BSSs) are unique main-sequence (MS) stars that are brighter, bluer, and appear younger than their coeval counterparts, hence more massive than MS stars. They are positioned to the left and above the main-sequence turnoff (MSTO) in the optical color-magnitude diagram (CMD).
One of the places to look for and investigate the BSS population are globular clusters (GCs)—gravitationally bound groups of stars. Due to their relatively high masses, the blue straggler stars can be used to probe the internal dynamics of GCs.
Cosmic mystery deepens as astronomers find object flashing in both radio waves and X-rays
Astronomers from the International Center for Radio Astronomy Research (ICRAR), in collaboration with international teams, have made a startling discovery about a new type of cosmic phenomenon.
The object, known as ASKAP J1832-0911, emits pulses of radio waves and X-rays for two minutes every 44 minutes.
The paper, “Detection of X-ray Emission from a Bright Long-Period Radio Transient,” is published in Nature.
New high-resolution laser device reads millimeter-scale text from a mile away
You are the protagonist in a thriller. One morning, an unknown caller with a distorted voice says, “To save your city, solve the puzzle. Go to the coordinates. X marks the clue.” You rush to the spot and see an X on a distant billboard, too far to read. Your vision is sharp, but not that sharp. So, what do you do? A new laser emitter designed by a team of researchers from China could come to the rescue.
According to the study published in Physical Review Letters, the developed setup includes multiple laser emitters that enable super-resolution imaging of targets as small as millimeters in scale from a 1.36 kilometers (0.85 miles) distance in an outdoor urban environment. The device successfully images letter-shaped physical targets measuring 8×9 mm, with letter widths of 1.5 mm, placed at the far end of its imaging range.
Interferometry is a widely used imaging technique in astronomy which works by merging light from different sources to create an interference pattern. These interference patterns are formed when light waves interact to either reinforce or cancel each other depending on their phase differences. These patterns carry detailed information about the object or phenomenon being studied.
SKYTRAIN: Cyberpunk Ambience | Futuristic Neon City Sounds for Deep Focus and Relaxation
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Mark Balaguer — Is Mathematics Eternal?
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Mathematics is like nothing else. The truths of math seem to be unrelated to anything else—independent of human beings, independent of the universe. The sum of 2 + 3 = 5 cannot not be true; this means that 3 + 2 = 5 would be true even if there were never any human beings, even if there were never a universe! When then, deeply, is mathematics?
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Mark Balaguer is Professor of Philosophy at California State University, Los Angeles. His major book is Platonism and Anti-Platonism in Mathematics.
Universe decays faster than thought, but still takes a long time
The universe is decaying much faster than thought. This is shown by calculations of three scientists at Radboud University on the so-called Hawking radiation. They calculate that the last stellar remnants take about 1078 years (a 1 with 78 zeros) to perish. That is much shorter than the previously postulated 101100 years (a 1 with 1100 zeros).