Dein Suchergebnis zum Thema: Black_Lives_Matter

A puzzle piece from stellar chemistry could change our measurements of cosmic expansion

https://www.mpg.de/14535346/a-puzzle-piece-from-stellar-chemistry-could-change-our-measurements-of-cosmic-expansion

Astronomers led by Maria Bergemann (Max-Planck-Institute for Astronomy) have performed chemical measurements on stars that could markedly change the way cosmologists measure the Hubble constant and determine the amount of so-called dark energy in our universe. Using improved models of how the presence of chemical elements affects a star’s spectrum, the researchers found that so-called supernovae Type Ia have different properties than previously thought. Based on assumption about their brightness, cosmologists have used those supernovae to measure the expansion history of the universe. In light of the new results, it is now likely those assumptions will need to be revised.
produced in the violent supernova explosions marking the end of certain stars’ lives

Origin of life on Earth through iron particles from meteorites as catalyst

https://www.mpg.de/20330250/0522-astr-iron-life-earth-150980-x?c=11970732

Researchers from the Max Planck Institute for Astronomy and the Ludwig Maximilian University of Munich have proposed a new scenario for the emergence of the first building blocks of life on Earth around 4 billion years ago. With the help of experiments, they recreate the conditions of Earth’s primordial atmosphere and show how iron particles from meteorites and volcanic ash could have acted as catalysts to convert the carbon dioxide-rich atmosphere into hydrocarbons, as well as acetaldehyde and formaldehyde. These substances are the building blocks for organic molecules such as fatty acids, nucleobases (building blocks of DNA), sugars and amino acids, which in turn are the basic building blocks of life.
Particle size matters.

The archaeological record of the Milky Way written by atomic hydrogen

https://www.mpg.de/15902255/the-archaeological-record-of-the-milky-way-written-by-atomic-hydrogen

An international group of astronomers, led by Juan Diego Soler of the Max Planck Institute for Astronomy, have found a complex network of filamentary structures of atomic hydrogen gas that pervades the Milky Way. They made this intricate web of gas visible by applying techniques from machine vision to THOR survey data that provides the most detailed view on the distribution of atomic hydrogen in the inner Milky Way to date. The scientists analysed the filaments’ orientations relative to the Milky Way disk using statistical methods and simulations. They inferred that the structure conserved an imprint of historic dynamical processes induced by the rotation of the galactic disk and feedback from ancient supernova explosions.
into their surroundings through winds, ionizing radiation, and at the end of their lives