Bulges
The Sa galaxy M104 (The Sombrero). The enormous bulge of this galaxy extends almost as far as the disk.
Credit: STScI/NASA ...
Bulge (astronomy)
In astronomy, a bulge is a huge, tightly packed group of stars. The term commonly refers to the central group of stars found in most spiral galaxies.
Bulge (?), n. [OE. bulge a swelling; cf. AS. belgan to swell, OSw. bulgja, Icel. bolginn swollen, OHG. belgan to swell, G. bulge leathern sack, Skr. bh to be large, strong; the root meaning to swell. Cf. Bilge, Belly, Billow, Bouge, n.] ...
Never observed anywhere in the bulge before, Terzan 5 could be the remains of a dwarf galaxy that merged with the Milky Way during its very early days.
BULGE
To swell or stick out; the part that swells or sticks out.
C
CELSIUS
A metric temperature scale in which water freezes at 0 degrees and boils at 100 degrees.
bulge
the generally spherical, central region of a spiral galaxy
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Bulge of the Earth The extra extension of the Earth's equator, caused by the centrifugal force of the Earth's rotation, which slightly flattens the spherical shape of the Earth.
Bulge
The stellar population that lies within several thousand light-years of the Galactic center. The bulge is old, dense, and metal-rich.
Buried Channel ...
The Bulge
Figure 11. An infrared telescope view of the entire sky showing the locations of the disk of the galaxy and the bulge. This view has the center of the galaxy in the middle. The extent of the bulge show how well named it is.
tidal bulge Elongation of the Earth caused by the difference between the gravitational force on the side nearest the Moon and the force on the side farthest from the Moon. The long axis of the tidal bulge points toward the Moon.
Nuclear Bulge
The spherical cloud of stars that lies at the center of spiral galaxies.
Nucleosynthesis ...
Bulge
The spherical structure at the center of a spiral galaxy that is made up primarily of old stars, gas, and dust. The Milky Way's bulge is roughly 15,000 light-years across.
Colliding Galaxies ...
Bulge, Galactic: A thick region around the center of the Galaxy that spheroidal in shape, containing warm gas and metal-rich older stars.
Bulge/disk ratios may be used as part of a fully quantitative classification scheme, paralleling but not fully mimicking the Hubble sequence. The major distinction remains that between bulge = pop. II = halo population (more or less) and disk = pop.
A bulge is a huge, tightly packed group of stars. The term commonly refers to the central group of stars found in most spiral galaxies.
The bulges move as Io orbits the giant planet. Io's crust flexes and heats the moon's interior. That is the source of energy for volcanoes that seem to constantly spew lava.
'The bulge in the neutron star causes the angle between the pulsar's rotation axis and its radio beam to change with time, creating the wobbling effect that we measure.'
Lyne emphasizes that the oblateness is incredibly small: ...
NUCLEAR BULGE
The nuclear bulge is the central, spherical part of a spiral galaxy. It is surrounded by a disk-shaped mass of stars with spiral arms.
Galactic Bulge - A somewhat flattened distribution of stars, about 6 kiloparsecs (kpc) in diameter, surrounding the nucleus of the Milky Way
Galactic Cannibalism - The capture and disruption of one galaxy by another ...
galactic bulge Thick distribution of warm gas and stars around the galactic center.
galactic cannibalism A galaxy merger in which a larger galaxy consumes a smaller one.
galactic bulge
The central bulge of a spiral galaxy, containing a massive amount of interstellar material and most likely a super-massive black hole in the centre.
These tidal bulges are always along the Earth-Moon line and the Earth rotates beneath the tidal bulge.
The central bulge contains at its core a very massive compact object; under the theory of general relativity, this compact object is a black hole. The mass of the central object is estimated to be 3.6 million times the mass of the Sun.
Battle of the Bulge
The Ardennes Offensive was a major German offensive launched towards the end of World War II through the forested Ardennes of Belgium , France and Luxembourg on the Western Front ....
At the center is the nuclear bulge (with possibly a bar) with radius of about 20,000 ly. The disk and the bulge are surrounded by the galactic halo, which is spherical and even larger than the galactic disk.
This tiny tidal bulge affects Mars' gravity field, which affects the orbital path of the MGS. By the precision tracking of MGS's orbit, the scientists can determine how flexible the planet is based upon how the bulge travels over Mars.
Plate 2: Galactic Bulge (between 285 and 65 degrees galactic longitude)
May 21/22, 1953, T. E. Houck and A. D. Code
Blue filter, 45 minute integration ...
Star with Midriff Bulge Eyed by Astronomers, JPL press release, July 25, 2001.
Imaging the Surface of Altair, University of Michigan news release detailing the CHARA array direct imaging of the stellar surface in 2007.
PIA04204: Altair, NASA.
The huge equatorial bulge on Mars is greatly affected by the Sun's gravitational attraction. The Jet Propulsion Laboratory estimates that Mars' axis tilt changes from 15° to 30° over a period of millions of years.
equatorial bulge (NASA SP-7, 1965) The excess of the earth's equatorial diameter over the polar diameter. equatorial electrojet (NASA SP-7, 1965) See electrojet.
The precession is due to the gravitational attraction of the moon and sun on the equatorial bulge of the earth, which causes the earth's axis to describe a cone in somewhat the same fashion as a spinning top.
Galaxies come in two major shapes: flattened disks with a central bulge, called spirals, and amorphous, semispherical blobs, called ellipticals. If galaxies are found bunched up next to each other, they are said to lie in groups or clusters.
The Milky Way has been determined to be a large spiral galaxy, with several spiral arms coiling around a central bulge about 10,000 light-years thick.
Without getting too much into the technical details, there are two bulges because of the differential gravitational forces.
Most of the stars in the central bulge and in the globular clusters of the galactic halo are old, low metals stars, and halo stars account for only 0.1 to 0.2 percent of the stars near Sol.
Classes include Sa/SBa, Sb/SBb or Sc/SBc (classic/barred) according to the tightness of their spiral, the clumpiness of their spiral arms, and the size of their central bulge.
The rotation of the Earth on its axis causes it to bulge at the equator and flatten at the poles.
The Moon's gravitation acts upon the Earth's oceans and atmosphere, causing two bulges to form. The bulge on the side of Earth that faces the moon is caused by the proximity of the moon and its relatively stronger gravitational pull on that side.
Since the Earth is not an exact sphere (it has a slight bulge at the equator) satellite orbits can be effected by the extra gravitational pull. A Sun-synchronous orbit uses this feature of the Earth's shape.
The Moon and Sun act on the Earth's rotational bulge, and cause the axis to wobble over a 26,000 year period. The result is that the axis continually moves in a small circle against the background stars.
Spirals are flat disks of stars with bright bulges in their centers. Spiral arms wrap around these bulges. Spiral arms probably form as the result of waves that sweep through the galactic disk.
From our perspective on the Earth's surface we see two small bulges, one in the direction of the Moon and one directly opposite. The effect is much stronger in the ocean water than in the solid crust so the water bulges are higher.
The gravitational pull of the moon causes the earth's oceans to bulge. This bulge is the high tide. In fact the moon causes the oceans to bulge in two places, the oceans facing the moon and the oceans facing away from the moon.
Looking at Jupiter's innermost large moon Io (pronounced ee-oo), a strange bulge seemed to be present on one side of this world.
Like other spiral galaxies, the Milky Way has a bulge, a disk, and a halo. Although all are parts of the same galaxy, each contains different types of objects.
The gravitational fields of Jupiter and its large moons Europa and Ganymede cause tidal bulges in the solid crust of Io that are as high as 100 meters (330 feet).
First, the tidal "bulge" cannot keep up with the Earth's rotation. Our oceans are relatively shallow and water has a lot of momentum (when moving) and a lot of inertia (when not moving).
The earth bulges at the equator. It has about a 43 km or 27 mile larger diameter when measured along the equator as compared to being measured pole to pole.
The dusty clouds of the Dark Horse nebula hide the northern part of the Milky Way's central bulge. The southern part (in Sagittarius) is relatively unobscured.
a squashed with a bulge at the equator. More detailed measurements show it to be shaped a bit like an inflated tetrahedron, although the approximation as a spheroid is accurate enough for most purposes.
The Milky Way is a spiral galaxy, shaped like a huge whirlpool coiling around a central bulge. It takes 200 million years to rotate once. It is so big that it would take about 100 000 years to go across it from one side to the other.
Surrounding the central nucleus of a spiral galaxy is a large nuclear bulge, which is nearly spherical in most cases and may have a diameter of up to half that of the disk.
The gravitational attraction of the moon causes the oceans to bulge out in the direction of the moon. Another bulge occurs on the opposite side, since the Earth is also being pulled toward the moon (and away from the water on the far side).
Because of the Earth's axial tilt, during most of the year the half of this bulge that is closest to the Sun is off-center, either to the north or to the south, and the far half is off-center on the opposite side.
Expansion phase--Dynamic auroral disturbances form a bulge and this is the interval of time in which the bulge grows Westward-traveling surge--the bulge develops a "kink" that appears to move west Omega bands--torchlike forms appear, ...
Such deformations are manifested in the form of slight bulges at the lunar surface, detectable only by sensitive instruments. The Moon, owing to its relatively large mass, exerts a gravitational force that likewise causes tides on the Earth.
It is caused by a slow wobble in the Earth's axis due to the gravitational effects of the Sun and Moon on the Earth's equatorial bulge. A reasonable analogy is that of a spinning top - As the top slows down it will start to wobble.
Normally refers to the precession of the equinoxes, a consequence of the effect of the Sun's gravity on Earth's equatorial bulge.
A spiral galaxy is shaped like a flat disk with a thicker bulge in the center. Bright spiral arms start from the center and then coil outward like a pinwheel. All spirals rotate very slowly.
Synchronous rotation occurs when a planet's gravity produces a tidal bulge in its satellite. The gravitational attraction and bulge acts like a torque, which slows down the satellite until it reaches a synchronous rotation.
 See also: Light, Orbit, Solar, Sun, Earth
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