UA-113443594-1

Satellite constellations harvest energy for near-total global coverage

ITHACA, N.Y. - Think of it as a celestial parlor game: What is the minimum number of satellites needed to see every point on Earth? And how might those satellites stay in orbit and maintain continuous 24/7 coverage while contending with Earth's gravity field, its lumpy mass, the pull of the sun and moon, and pressure from solar radiation? In the mid-1980s, researcher John E.…

When David poses as Goliath

Stellar black holes form when massive stars end their life in a dramatic collapse. Observations have shown that stellar black holes typically have masses of about ten times that of the Sun, in accordance with the theory of stellar evolution. Recently, a Chinese team of astronomers claimed to have discovered a black hole as massive as 70 solar masses, which, if confirmed, would severely challenge…

Leading astronomers and geophysicists honored in RAS bicentenary

IMAGE: Professor Sandra Moore Faber. view more  Credit: Steve Kurtz / UC Santa Cruz The Royal Astronomical Society is pleased to announce the winners of its medals and prizes for 2020, the bicentenary of the foundation of the RAS. Each year the Society recognises significant achievement in the fields of astronomy and geophysics through these awards. The announcements were made at the Ordinary Meeting of the…

Shocked meteorites provide clues to Earth’s lower mantle

IMAGE: Artist's rendition of Earth, cut away to reveal individual layers, including the deep mantle. view more  Credit: Mingming Li/ASU Deep below the Earth's surface lies a thick rocky layer called the mantle, which makes up the majority of our planet's volume. While Earth's mantle is too deep for humans to observe directly, certain meteorites can provide clues to this unreachable layer. In a study recently…

NASA’s Newest Astronauts Ready for Space Station, Moon, and Mars Missions

NASA welcomed 11 new astronauts to its ranks Friday, increasing the number of those eligible for spaceflight assignments that will expand humanity’s horizons in space for generations to come.

Planet WASP-12b is on a death spiral, say Princeton scientists

IMAGE: An artist created this illustration of the searing-hot gas planet WASP-12b and its star. A Princeton-led team of astrophysicists has shown that this exoplanet is spiraling in toward its host... view more  Credit: NASA/JPL-Caltech Earth is doomed -- but not for 5 billion years. Our planet will be roasted as our sun expands and becomes a red giant, but the exoplanet WASP-12b, located 600 light-years…

Fast radio burst observations deepen astronomical mystery

IMAGE: Image of the host galaxy of FRB 180916 (center) acquired with the 8-meter Gemini-North telescope of NSF's OIR Lab on Hawaii's Maunakea. Images acquired in SDSS g', r', and z'... view more  Credit: GEMINI OBSERVATORY/NSF'S NATIONAL OPTICAL-INFRARED ASTRONOMY RESEARCH LABORATORY/AURA Observations with the 8-meter Gemini North telescope, a program of the NSF's National Optical-Infrared Astronomy Research Laboratory, have allowed astronomers to pinpoint the location of…

The Milky Way’s impending galactic collision is already birthing new stars

Honolulu -- The outskirts of the Milky Way are home to the galaxy's oldest stars. But astronomers have spotted something unexpected in this celestial retirement community: a flock of young stars. More surprising still, spectral analysis suggests that the infant stars have an extragalactic origin. The stars seemingly formed not from material from the Milky Way, but from two nearby dwarf galaxies known as the…

Cosmic bubbles reveal the first stars

IMAGE: This rendition shows ionized bubbles formed by three galaxies in galaxy cluster EGS77. view more  Credit: V. Tilvi et al./NSF's National Optical-Infrared Astronomy Research Laboratory/KPNO/AURA Astronomers using the Mayall telescope at Kitt Peak National Observatory, a program of NSF's National Optical-Infrared Astronomy Research Laboratory, have identified several overlapping bubbles of hydrogen gas ionized by the stars in early galaxies, a mere 680 million years after…

NASA sees Tropical Storm Blake’s center off Australia’s Kimberley Coast

IMAGE: On Jan. 7, 2020, the MODIS instrument that flies aboard NASA's Terra satellite provided a visible image of Tropical Storm Blake near the Kimberley coast of Western Australia. The MODIS... view more  Credit: NASA Worldview, Earth Observing System Data and Information System (EOSDIS) NASA's Terra satellite passed over the Southern Indian Ocean on January 7 and found the center of Tropical Storm Blake just of…
- Advertisement -

LATEST NEWS

MUST READ