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6 mentions found


☆ Near collapse of Earth’s magnetic field 591 million years ago may have allowed complex life to thrive
  + stars: | 2024-05-07 | by ( Katie Hunt | ) edition.cnn.com   time to read: +8 min
CNN —Earth’s magnetic field plays a key role in making our planet habitable. However, Earth’s magnetic field almost collapsed 591 million years ago, and this change, paradoxically, may have played a pivotal role in the blossoming of complex life, new research has found. The discovery of the sustained weakening of Earth’s magnetic field also helped resolve an enduring geological mystery about when Earth’s solid inner core formed. Shuhai Xiao/Virginia TechUncovering the magnetic field’s near collapseThe intensity of Earth’s magnetic field is known to fluctuate over time, and crystals preserved in rock contain tiny magnetic particles that lock in a record of the intensity of Earth’s magnetic field. The research on the intensity of Earth’s magnetic field suggests that the age of Earth’s inner core is on the younger end of that timescale, solidifying after 565 million years ago and allowing Earth’s magnetic shield to bounce back.
Persons: “, ”, John Tarduno, Xiao, Tarduno, Shuhai Xiao, ” Tarduno, Peter Driscoll, wasn’t, ” Driscoll Organizations: CNN, University of Rochester, Environment, Virginia Tech, Laboratory, Carnegie Institution for Science Locations: New York, South Australia, Virginia, Quebec, Brazil, South Africa, Washington ,, Newfoundland, Canada
☆ Special moments to watch for during the April 8 total eclipse
  + stars: | 2024-04-01 | by ( Ashley Strickland | ) edition.cnn.com   time to read: +7 min
CNN —When the total solar eclipse traces a path across Mexico, the United States and Canada on April 8, spectators can anticipate a multitude of awe-inspiring moments. For those living outside of the path of totality, a crescent-shaped partial eclipse, rather than a total eclipse, will be the main event. A partial solar eclipse is seen between clouds from Socorro in Sao Paulo, Brazil on October 14, 2023. The diamond ring effect is seen during the total solar eclipse on August 21, 2017, in St. Louis, Missouri. And we’re living at the right time to truly enjoy the sight of a total eclipse on Earth, he said.
Persons: ”, John Mulchaey, Crawford H, Greenewalt, it’s, Robyn Beck, Igor, ” Mulchaey, “, It’s, you’re, Mulchaey, Francis Baily, Heinz, Peter Bader, X00316, Tim Spyers, Andrew Farnsworth Organizations: CNN, Carnegie Institution, Carnegie, NASA, Cornell, of Ornithology Locations: Mexico, United States, Canada, “, Prairie, AFP, Socorro, Sao Paulo, Brazil, St, Louis , Missouri
☆ Three new moons discovered orbiting Uranus and Neptune
  + stars: | 2024-02-28 | by ( Ashley Strickland | ) edition.cnn.com   time to read: +5 min
CNN —Astronomers have discovered three previously unknown moons around Uranus and Neptune, the most distant planets in our solar system. In the future, the tiny satellite will be named after a Shakespearean character, in keeping with the tradition of Uranus’ moons bearing literary names. He worked with Marina Brozovic and Bob Jacobson of NASA’s Jet Propulsion Laboratory in Pasadena, California, to determine the moon’s orbit. The outer moons orbiting all the giant planets across our solar system — Jupiter, Saturn, Uranus and Neptune — share similar configurations. “Even Uranus, which is tipped on its side, has a similar moon population to the other giant planets orbiting our Sun,” Sheppard said.
Persons: ”, Scott S, Sheppard, Marina Brozovic, Bob Jacobson, Scott Sheppard, David Tholen, Chad Trujillo, Patryk Sofia Lykawka, ” Sheppard, Neptune Organizations: CNN —, Carnegie Institution for Science, Planet, NASA’s Jet Propulsion Laboratory, Carnegie Science, Subaru, University of Hawaii, Northern Arizona University, Kindai University Locations: Chile, Pasadena , California, Kea, Japan, Neptune
☆ Scientists propose sweeping new law of nature, expanding on evolution
  + stars: | 2023-10-16 | by ( Will Dunham | ) www.reuters.com   time to read: +4 min
Evolution occurs, it holds, when these various configurations are subject to selection for useful functions. "We have well-documented laws that describe such everyday phenomena as forces, motions, gravity, electricity and magnetism and energy," Hazen said. The subsequent generation of stars that formed from the remnants of the prior generation then similarly forged almost 100 more elements. "Imagine a system of atoms or molecules that can exist in countless trillions of different arrangements or configurations," Hazen said. "Only a small fraction of all possible configurations will 'work' - that is, they will have some useful degree of function.
Persons: Charles Darwin, Darwin, Robert Hazen, Hazen, Michael Wong, Jonathan Lunine, Will Dunham, Lisa Shumaker Organizations: Carnegie Institution for Science, National Academy of Sciences, Carnegie, Cornell, Thomson Locations: British
☆ 'Planet killer' asteroid hidden by the sun may threaten Earth in a few thousand years
  + stars: | 2022-11-01 | by ( Morgan Mcfall-Johnsen | ) www.businessinsider.com   time to read: +5 min
Astronomers discovered a "planet killer" asteroid that may pose a threat to Earth in future millennia. That makes it a "planet killer," Scott S. Sheppard, an astronomer at the Carnegie Institution for Science, said in a press release announcing the discovery on Monday. But there could be other planet killer asteroids lurking unseen in the blind spot where 2022 AP7 was discovered: within the orbits of Earth and Venus, between us and the sun. That makes it very difficult to spot asteroids located between Earth and the sun. "There are likely only a few [near-Earth asteroids] with similar sizes left to find," Sheppard said in the release.
☆ Side-by-side photographic glass plates and James Webb images show how telescope technology has evolved since the 1800s
  + stars: | 2022-09-10 | by ( Paola Rosa-Aquino | ) www.businessinsider.com   time to read: +8 min
In the 19th and early 20th centuries, astronomers catalogued the universe on glass photographic plates. Compared to faint objects stamped on plates, the James Webb Space Telescope's images show dramatic improvements in telescope technology. The exposures were made on glass plates coated with photosensitive emulsions, with astronomers later developing the plates like film in a darkroom. Compared with Webb's infrared images, photographic plates of the same parts of the night sky show how developments in technology led to clearer and deeper views of the cosmos. Webb's clear views of interacting galaxies offer sharper detail than faint glass plate imagesA glass plate image of Stephan's Quintet taken in 1974, left.
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