Gravitational interaction as a research area encompasses the theoretical, computational, and experimental study of how mass-energy curves spacetime and governs the dynamics of astrophysical and cosmological systems. It includes general relativity, tests of the equivalence principle, post-Newtonian approximations, and numerical relativity for compact-object binaries and gravitational-wave sources. The field also investigates modifications of gravity, dark matter and dark energy phenomenology from a gravitational perspective, strong- and weak-field regimes, gravitational lensing, and structure formation. Research involves precision experiments, multi-messenger astronomy, and the development of effective field theories and quantum-gravity–motivated models to probe deviations from classical gravitational dynamics.
Four Artemis II astronauts are taking a giant step for humankind Monday when they shoot deeper into space than anyone before and glimpse parts of the moon never seen by the naked eye.
Space Exploration
Apr 6, 2026
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The Artemis astronauts entered the final phase of their run-up to a lunar loop on Monday, a tipping point of sorts that means the moon's gravity is now having a stronger pull on the spacecraft than Earth's.
Space Exploration
Apr 6, 2026
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As four astronauts whiz toward a flyby of the moon, looking out for them are mission control experts using cutting-edge technology and lessons learned from the Apollo program 50 years ago.
Space Exploration
Apr 4, 2026
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The Artemis 2 astronauts have passed the halfway point between Earth and the moon on Saturday as they sped toward a planned lunar flyby, with NASA releasing initial images of Earth taken from inside the Orion spacecraft.
Space Exploration
Apr 4, 2026
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Artemis 2 astronaut Jeremy Hansen felt like he was "falling out of the sky" as his spacecraft followed its complex flight path to the moon, the Canadian said in a Saturday video call.
Space Exploration
Apr 4, 2026
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NASA's Artemis II astronauts fired their engines and blazed toward the moon Thursday night, breaking free of the chains that have trapped humanity in shallow laps around Earth in the decades since Apollo.
Space Exploration
Apr 3, 2026
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It's humanity's first flight to the moon since 1972.
Space Exploration
Mar 31, 2026
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In September 2022, humanity crashed a spacecraft into an asteroid—on purpose. The objective of NASA's Double Asteroid Redirection Test (DART) was to see if we could intentionally modify the orbit of Dimorphos, the small moonlet ...
Space Exploration
Mar 30, 2026
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NASA's Apollo moonshots are a tough act to follow, even after all this time.
Space Exploration
Mar 30, 2026
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Greek mythology has given a name to a great many objects in our solar system. But perhaps one of the least well understood are the Trojans, named after the people of Troy featured in "The Iliad." When astronomers refer to ...
Astronomy
Mar 18, 2026
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