These oddball galaxies are missing their dark matter

These oddball galaxies are missing their dark matter

In the cosmic equivalent of a total knock-out punch, two galaxies collided some eight billion years ago and kicked the gas out of each other. That’s the latest explanation for a cosmic mystery that’s had astronomers scratching their heads since 2018: two dim, puffy galaxies that appear to be completely devoid of dark matter. New … Read more

Black-hole image sheds light on Milky Way mysteries

Black-hole image sheds light on Milky Way mysteries

The first image of our Galaxy’s supermassive black hole, released earlier this month, has already begun to explain some enduring mysteries about the heart of the Milky Way. The wealth of new information about the black hole, called Sagittarius A *, joins many other lines of evidence that are now painting a detailed picture of … Read more

Hot-Blooded or Cold-Blooded? Chemical Clues Solve One of the Oldest Mysteries in Paleontology

Hot-Blooded or Cold-Blooded?  Chemical Clues Solve One of the Oldest Mysteries in Paleontology

Schematic drawing of a subset of the animals that were investigated as part of the research. Metabolic rates and resulting thermophysiological strategies are color-coded, orange hues characterize high metabolic rates coinciding with warm-bloodedness, and blue hues characterize low-metabolic rates coinciding with cold-bloodedness. From left to right: Plesiosaurus, Stegosaurus, Diplodocus, Allosaurus, Calypte (modern hummingbird). Credit: © … Read more

Morphology of Palaeospondylus shows affinity to tetrapod ancestors

Traquair, RH On the fossil fishes at Achanarras Quarry, Caithness. Ann. Mag. Nat. Hist. 6479–486 (1890). Google Scholar Article Jarvik, E. Basic Structure and Evolution of Vertebrates Vol. I (Academic Press, 1980). Ahlberg, PE, Clack, JA & Lukševičs, E. Rapid braincase evolution between Panderichthys and the earliest tetrapods. Nature 38161–64 (1996). ADS CASE Article Google … Read more

Did dinosaur blood run warm or cold? Long-standing question may finally have an answer

This illustration depicts, from left, plesiosaurus, stegosaurus, diplodocus, allosaurus and calypte (modern hummingbird), with red hues indicating warm-bloodedness and blue hues for cold-bloodedness. (J. Wiemann) Estimated read time: 4-5 minutes ATLANTA – Fearsome predators like T. rex and towering, telescope-necked dinosaurs, such as brachiosaurus, were warm-blooded creatures in the same way birds and mammals are, … Read more