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Search resuls for: "NASA's Goddard Space Flight Center"


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☆ S.Korea's Yoon to meet Biden as doubts grow over nuclear umbrella
  + stars: | 2023-04-24 | by ( Hyonhee Shin | ) www.reuters.com   time to read: +4 min
More than 64% supported South Korea developing its own nuclear weapons, with about 33% opposed. Yoon has been pushing to boost South Korea's say in operating the U.S. extended deterrence but exactly what that might entail has not been spelt out. A senior U.S. official said on Friday that Biden, during the summit with Yoon, would pledge "substantial" steps to underscore U.S. commitments to deter a North Korean nuclear attack. South Korea, a major producer of artillery shells, says it has not provided lethal weapons to Ukraine, citing its relations with Russia. South Korea tries to avoid antagonising Russia, due chiefly to business interests and Russian influence over North Korea.
☆ Giant 'holes' dozens of times the size of our planet are appearing on the sun. Here's how they could affect Earth.
  + stars: | 2023-03-29 | by ( Marianne Guenot | ) www.businessinsider.com   time to read: +11 min
Two huge coronal holes, dozen of times the size of the Earth, have appeared on the sun. These coronal holes can spew solar winds at 1.8 million mph toward our planet, which can cause stunning auroras and disrupt satellites. Coronal holes aren't actually holes in the sunA coronal hole rotates across the face of the sun, streaming solar wind towards Earth, February 1, 2017. Coronal holes happen in the "corona," the atmosphere of the sun, and can only be seen in UV or X-ray light. We could see this month's coronal holes again next monthThe coronal hole came into view as the sun rotated.
☆ The solar system was hit with a gamma-ray burst so bright, it blinded scientists' equipment in space
  + stars: | 2023-03-29 | by ( Chris Panella | Jessica Orwig | ) www.businessinsider.com   time to read: +5 min
Our solar system was hit by a gamma-ray burst so bright, it blinded space equipment and telescopes. A gamma-ray burst that recently hit our solar system was so bright, it temporarily blinded gamma-ray instruments in space, according to a NASA release. Scientists say the gamma-ray burst (GRB), the most powerful type of explosion in the universe, was 70 times brighter than any previously recorded event. What is a gamma-ray burst? Because it blinded space instruments, they couldn't accurately record it, so scientists weren't sure how bright the burst was when it first reached our planet.
☆ The 2023 spring equinox is here — here's what it is and how it works
  + stars: | 2023-03-20 | by ( Dave Mosher | Shayanne Gal | Marianne Guenot | ) www.businessinsider.com   time to read: +5 min
The vernal or spring equinox of 2023 happens Monday, March 20. Technically, two things: Earth's tilted axis and the planet's orbit around the sun. How the spring equinox worksThe Earth orbits the sun once every 365 days and six hours. The spring equinox occurs when the sun's warming rays line up perpendicular to Earth's axial tilt:An illustration of the spring equinox. About 92 days and 19 hours after the spring equinox, the Earth will reach its summer solstice.
☆ The 2023 spring equinox is on its way — here's what it is and how it works
  + stars: | 2023-03-17 | by ( Dave Mosher | Shayanne Gal | Marianne Guenot | ) www.businessinsider.com   time to read: +5 min
The vernal or spring equinox of 2023 happens Monday, March 20. Technically, two things: Earth's tilted axis and the planet's orbit around the sun. How the spring equinox worksThe Earth orbits the sun once every 365 days and six hours. The spring equinox occurs when the sun's warming rays line up perpendicular to Earth's axial tilt:An illustration of the spring equinox. About 92 days and 19 hours after the spring equinox, the Earth will reach its summer solstice.
☆ Explainer: What to expect during the green comet's encounter with Earth
  + stars: | 2023-01-30 | by ( Joey Roulette | ) www.reuters.com   time to read: +3 min
Nicknamed "dirty snowballs" by astronomers, comets are balls of ice, dust and rocks that typically hail from the ring of icy material called the Oort cloud at our solar system's outer edge. One known comet actually originated outside the solar system - 2I/Borisov. Comets are composed of a solid core of rock, ice and dust and are blanketed by a thin and gassy atmosphere of more ice and dust, called a coma. Its greenish, emerald hue reflects the comet's chemical composition - it is the result of a clash between sunlight and carbon-based molecules in the comet's coma. NASA plans to observe the comet with its James Webb Space Telescope (JWST), which could provide clues about the solar system's formation.
☆ One year after volcanic blast, many of Tonga's reefs lay silent
  + stars: | 2023-01-15 | by ( Gloria Dickie | ) www.reuters.com   time to read: +5 min
Coral reefs were turned to rubble and many fish perished or migrated away. Following the eruption, the Tongan government said it would seek $240 million for recovery, including improving food security. SILENT REEFSThe vast majority of Tongan territory is ocean, with its exclusive economic zone extending across nearly 700,000 square kilometres (270,271 square miles) of water. It is likely volcanic ash smothered many reefs, depriving fish of feeding areas and spawning beds. While volcanic eruptions on land eject mostly ash and sulfur dioxide, underwater volcanos jettison far more water.
☆ The James Webb Space Telescope is astronomy's shiny new toy, but the Hubble Space Telescope isn't old news — it's at its scientific peak
  + stars: | 2022-08-28 | by ( Paola Rosa-Aquino | ) www.businessinsider.com   time to read: +7 min
Since its launch in 1990, the Hubble Space Telescope has made revolutionary achievements in astronomy. The new James Webb Space Telescope is popular, but Hubble has skills, like capturing visible and ultraviolet light, that Webb doesn't. "The Webb Space Telescope is good news for astronomy, and good news for the Hubble Space Telescope as well, since Webb and Hubble enhance and complement each other's unique capabilities," Jennifer Wiseman, senior project scientist for the Hubble Space Telescope at NASA's Goddard Space Flight Center, told Insider. A globular cluster NGC 6540 in the constellation Sagittarius, which was captured by the Hubble Space Telescope. A deep field image from the Hubble space telescope, left, and a deep field image from the James Webb Space Telescope, right.
☆ The December solstice is here. Here's how it works and why it starts winter and summer at the same time.
  + stars: | 2018-12-21 | by ( Marianne Guenot | Shayanne Gal | ) www.businessinsider.com   time to read: +5 min
The 2022 winter solstice happens on Wednesday 21 December at 4:48 p.m. It is the winter solstice in the northern hemisphere but the summer solstice in the southern. This is due to Earth's tilted axis as it orbits around the sun. How the December solstice worksThe winter solstice is the point when the sun will stay closest to the horizon all day. At that point, the sun's most direct rays reach the Tropic of Cancer, summer starts for the northern hemisphere, and winter begins for those south of the equator.
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