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  1. Vor 16 Stunden · See a pair of superheavy neutron stars collide in this simulation with gravitational wave audio. "An audible tone and a visual frequency scale (at left) track the steady rise in the frequency of gravitational waves as the neutron stars close," according to NASA's Goddard Spaceflight Center. Credit: NASA's Goddard Space Flight Center and STAG Research Centre/Peter Hammond

    • 2 Min.
    • Space.com
  2. en.wikipedia.org › wiki › NonmetalNonmetal - Wikipedia

    Vor 16 Stunden · v. t. e. In chemistry, a nonmetal is a chemical element that mostly lacks distinctive metallic properties. They range from colorless gases like hydrogen to shiny crystals like iodine. Physically, they are usually lighter (less dense) than metals and are often poor conductors of heat and electricity. Chemically, nonmetals have relatively high ...

  3. Vor 16 Stunden · Hyperactive Sunspot Eruption Seen By Spacecraft. Extremely active sunspot AR3664 blasted a major X8.7-class solar flare. The sunspot was behind the incredible geomagnetic storms that recently bathed Earth in auroras. Credit: Space.com | footage courtesy: NASA / SDO and the AIA, EVE, and HMI science teams /HelioViewer| edited by Steve Spaleta.

  4. Vor 16 Stunden · Space.com. A pair of Russian Su-27 aircraft intercepted a US MQ-9 drone. “They dumped fuel upon and struck the propeller of the MQ-9,” according to U.S. European Command. The "unsafe" Intercepts forced U.S. forces to bring the MQ-9 down in international waters. Credit: U.S. European Command | edited by Space.com's Steve Spaleta.

    • 1 Min.
    • Space.com
  5. Vor 16 Stunden · Superheavy Neutron Star Merger's Audio Jumps Thousands Of Hertz In Simulation. Space.com. 1:04. Big Fireball Streaks Across Skies Seen Over 12 US States & Canada. Space.com . 1:06. Time-Lapse Of Sun Erupting With Long-Duration X1.6-Class ...

  6. 21. Juni 2024 · We discuss the stochastic gravitational wave background emitted from a network of 'quasi-stable' strings (QSS) and its realization in grand unified theories. A symmetry breaking in the early universe produces monopoles that suffer partial inflation. A subsequent symmetry breaking at a lower energy scale creates cosmic strings that are effectively stable against the breaking via Schwinger ...

  7. Vor 16 Stunden · 序号164的稳定元素,就在小行星的内部?灵神星探测器揭开迷雾太阳系的小行星也许含有未被发现的超重元素几个世纪以来,搜寻新元素是许多科学领域的...