The spectral degeneracies emerging as a consequence of parity-time (PT) symmetry exhibit a profound divergence from their conventional counterparts. They possess non-Hermitian nature and are designated as exceptional points ...
Optics & Photonics
17 minutes ago
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0
A team of Chinese astronomers has performed photometric observations of a dwarf nova known as Karachurin 12. As a result, they have found that Karachurin 12 is an IW And-type star. The discovery was detailed in a research ...
A billionaire will have to wait a little longer to perform the first private spacewalk after SpaceX delayed Thursday's spacewalk by a few hours.
Space Exploration
10 hours ago
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13
NASA and its industry partners continue to make progress toward Artemis III and beyond, the first crewed lunar landing missions under the agency's Artemis campaign.
Space Exploration
22 hours ago
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A Soyuz spacecraft carrying two Russians and an American docked at the International Space Station on Wednesday, a little more than three hours after its launch.
Space Exploration
Sep 11, 2024
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5
Chinese researchers have discovered a promising mass-gap black hole using radial velocity and astrometry methods. The study was published online in Nature Astronomy on Sept. 10, and was conducted by a team led by Dr. Wang ...
Astronomy
Sep 11, 2024
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26
SpaceX launched its historic Polaris Dawn mission on Tuesday—an audacious orbital expedition that will catapult civilians into a high-radiation region of space and see them attempt the first-ever spacewalk by non-professional ...
Space Exploration
Sep 10, 2024
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83
Now that its reflective sail has deployed fully open in orbit, the Advanced Composite Solar Sail System can be seen in the night sky from many locations across the world!
Space Exploration
Sep 9, 2024
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20
Space is an unnatural environment for humans. We can't survive unprotected in a pure vacuum for more than two minutes. Getting to space involves being strapped to a barely contained chemical explosion.
Space Exploration
Sep 7, 2024
0
15
New evidence suggests that billions of years ago, a star may have passed very close to our solar system. As a result, thousands of smaller celestial bodies in the outer solar system outside Neptune's orbit were deflected ...
Planetary Sciences
Sep 6, 2024
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In physics, an orbit is the gravitationally curved path of one object around a point or another body, for example the gravitational orbit of a planet around a star.
Historically, the apparent motion of the planets were first understood in terms of epicycles, which are the sums of numerous circular motions. This predicted the path of the planets quite well, until Johannes Kepler was able to show that the motion of the planets were in fact elliptical motions.[citation needed] Isaac Newton was able to prove that this was equivalent to an inverse square, instantaneously propagating force he called gravitation.[citation needed] Albert Einstein later was able to show that gravity is due to curvature of space-time, and that orbits lie upon geodesics. This is the current understanding.
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