By measuring the rapid orbits of
the stars near the center of our galaxy, Dr. Ghez and her colleagues have moved the case for a supermassive black hole at the heart of the Milky Way from a possibility to a certainty.
A giant
star near the center of our galaxy hints, once again, that Albert Einstein was correct about gravity.
Not exact matches
A
star ripped to shreds by a massive black hole may explain a strange feature
near the
center of our
galaxy.
Stars can grow no bigger than 150 times as massive as our sun, according to a study
of the dazzling «Arches» cluster
near the
center of our
galaxy — shown here in an artist's impression.
SIM will also measure the motions
of stars near the
center of many
galaxies, which should tell us whether they harbor enormous black holes at their core.
Over the next several years, new infrared measurements showed that much
of the gas and clouds and even entire
stars nearest the
center weren't simply rotating with the rest
of the
galaxy.
For this to occur, outside forces would have to compress the gas clouds
near the
center of our
galaxy to overcome the violent nature
of the region and allow gravity to take over and form
stars.
Those
stars got their higher velocities before space was stretched out — when they were
nearer the
center of their
galaxy, where the
galaxy's gravity was much more powerful.
Before the heavens were stretched out, those
stars had high velocities, because they were
near a
galaxy's
center of mass where a black hole was growing.
«We found the clumps
of CO gas far from the
galaxy's
center, and not
near the regions
of current
star formation,» Walter said.
An intensive study
of a neighboring dwarf
galaxy has surprised astronomers by showing that most
of its molecular gas — the raw material for new
stars — is scattered among clumps in the
galaxy's outskirts, not
near its
center as they expected.
All
galaxies, including our own, are believed to be embedded in and surrounded with halos
of dark matter, which is what astronomers posit causes
stars far from the galactic
center to move as fast as those
near the
center.
A group
of astronomers in Germany and the Czech Republic observed three
stars in a cluster
near the supermassive black hole at the
center of the Milky Way
galaxy.
The position
of the supermassive black hole at the
center of our Milky Way
galaxy, as well as the giant
star S2, are shown (inset) in this
near - infrared image from the European Southern Observatory's Very Large Telescope in Chile.
These regions, called cosmic masers, are found in areas where new
stars are forming and
near the
centers of galaxies.