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A list of known near-Earth asteroid close approaches less than 1 lunar distance (0.0025696 AU (384,410 km; 238,860 mi)) from Earth in 2023. [1] As most asteroids passing within a lunar distance are less than 40 meters in diameter, they generally are not detected until they are within several million km of Earth.
Scientists have observed for the first time the faint ripples caused by the motion of black holes that are gently stretching and squeezing everything in the universe. “It’s really the first ...
Keith Riles was born in Starkville, Mississippi in 1960, and grew up in New Orleans and Redondo Beach.. He earned his B.A. in physics from University of California, Berkeley in 1982, and his Ph.D. from Stanford in 1989. [3]
The gravitational wave observatories LIGO, Virgo in Italy, and KAGRA in Japan are coordinating to continue observations after the COVID-caused stop, and LIGO's O4 observing run started on 24 May 2023. [19] [20] LIGO projects a sensitivity goal of 160–190 Mpc for binary neutron star mergers (sensitivities: Virgo 80–115 Mpc, KAGRA greater ...
The blue lines are gravitational waves, ripples in time and space, which is how astronomers detected the merger, and orange and red areas indicate parts of the neutron star being stripped away.
A 15-year study has revealed the cosmic background noise of gravitational waves echoing across the universe for the first time.
17 August 2017: Gravitational wave detected from merger of two neutron stars (00:23 video; artist concept). On 17 August 2017, the LIGO and Virgo interferometers observed GW170817, [7] a gravitational wave associated with the merger of two neutron stars in NGC 4993, an elliptical galaxy in the constellation Hydra about 140 million light years away. [8]
A passing gravitational wave will slightly stretch one arm as it shortens the other. This is precisely the motion to which a Michelson interferometer is most sensitive. [citation needed] Even with such long arms, the strongest gravitational waves will only change the distance between the ends of the arms by at most roughly 10 −18 meters.
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related to: gravitational ripples 2023 calendartemu.com has been visited by 1M+ users in the past month