Harvard-Smithsonian Center for Astrophysics

'Oumuamua one year later

One year ago this week astronomers discovered an unusual object moving through space not too far from the Earth's orbit. In just a few days they realized it could not be a normal asteroid or comet – its path showed that ...

dateOct 22, 2018 in Space Exploration
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Active galactic nuclei and star formation

Most galaxies host a supermassive black hole (SMBH) at their nucleus. (A supermassive black hole is one whose mass exceeds a million solar-masses.) A key unresolved issue in galaxy formation and evolution is the role these ...

dateOct 15, 2018 in Astronomy
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Remarkable flares from the galactic center

Sagittarius A* (Sgr A*), the supermassive black hole at the center of our Milky Way Galaxy, is 100 times closer to us than any other SMBH and therefore a prime candidate for studies of how matter radiates as it accretes onto ...

dateOct 08, 2018 in Astronomy
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Four newly discovered Milky Way neighbors

Ultra-faint dwarf galaxies are the smallest, most dark matter dominated, and least chemically enriched stellar systems in the universe, and are important targets for understanding dark matter and galaxy formation. They comprise ...

dateOct 01, 2018 in Astronomy
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A new classification scheme for exoplanet sizes

There are about 4433 exoplanets in the latest catalogs. Their radii have generally been measured by knowing the radius of their host star and then closely fitting the lightcurves as the planet transits across the face of ...

dateSep 24, 2018 in Astronomy
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