Stellar dynamics is the research area within astrophysics that investigates the gravitational interactions, phase-space evolution, and collective behavior of stellar systems such as star clusters, galactic disks, and spheroidal components. It employs N-body simulations, kinetic theory (e.g., the Boltzmann and Vlasov equations), and perturbation methods to study relaxation processes, resonances, instabilities, and secular evolution driven by both collisional and collisionless effects. Stellar dynamics underpins quantitative models of mass distributions, dark matter inference from stellar kinematics, formation and survival of bound structures, and the dynamical impact of central massive black holes and external tidal fields on stellar systems.
Earth seems like a troubled place right now, but at least our cosmic surroundings appear peaceful. This is not universally true, as explosions, collisions and other dangers lurk in other places and times.
Astronomy
Oct 6, 2026
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Galaxies are like snowflakes: No two are exactly alike, even the spirals. The Hubble Space Telescope took a close look at the distant spiral NGC 4698 and found intriguing hints about its past. For one thing, this member of ...
Astronomy
Sep 29, 2026
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Astronomers using data from the Euclid space telescope have discovered an exceptionally faint stellar system near the Fornax dwarf galaxy. Called Fornax-7, it appears to contain only about 170 times the mass of the sun in ...
A new study suggests that the young stars orbiting the Milky Way's central black hole may have a surprisingly ordinary origin. But the black hole's influence may be what makes their origin look more exotic than it really ...
The Nancy Grace Roman Space Telescope is set to launch this weekend aboard a SpaceX rocket from Kennedy Space Center in Florida. When it becomes operational early next year, it will transform our view of the universe.
Astronomy
Aug 28, 2026
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Most of the stars in our Milky Way galaxy sit neatly on a flat plane. But the space around our galaxy is much more chaotic. Rogue bands of stars called "stellar streams" orbit the Milky Way much like planets in our solar ...
Astronomy
Aug 27, 2026
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Astronomers have discovered the fastest known star in our galaxy, the Milky Way, orbiting the black hole at its center. The star, named S301, was detected with the European Southern Observatory's Very Large Telescope Interferometer ...
Astronomy
Aug 19, 2026
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In the image above, a faint trail of stars can be seen stretching across the galaxy. These structures, known as globular cluster stellar streams, are coherent stellar structures that retain a record of their dynamical history ...
Astronomy
Aug 12, 2026
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The Sloan Digital Sky Survey V (SDSS-V) has announced its 20th public data release (DR20), delivering a dramatic expansion of the Milky Way Mapper (MWM) scientific survey—the most detailed spectroscopic map yet assembled ...
Astronomy
Aug 6, 2026
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A team of astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) has captured a massive stream of gas—one trillion miles, or 0.2 light-years, long—feeding the young triple-star system GW Orionis. These ...
Astronomy
Aug 6, 2026
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