For this reason, the amplitude of the galaxy rotation curve is related to the galaxy's mass ; the Tully-Fisher relation is a direct observation of a close relationship between galaxy stellar mass ( which sets the luminosity ) and total gravitational mass ( which sets the amplitude of the rotation curve ).

It contains approximately 23 % of the galaxy's total stellar mass and contributes about 10 % of the galaxy's new stars.

The luminosity is the amount of light energy emitted by the galaxy per unit time ; it can be measured using the galaxy's apparent brightness when the distance to the galaxy is known.

He also surveyed the galaxy's stars distribution down to magnitude 19. 4.

Three hundred years later, the American astronomical historian William Ashworth suggested that what Flamsteed may have seen was the most recent supernova in the galaxy's history, an event which would leave as its remnant the strongest radio source outside of the solar system, known in the third Cambridge ( 3C ) catalogue as 3C 461 and commonly called Cassiopeia A by astronomers.

The galaxy's light now observable on Earth would have begun to emanate from its source about 750 million years after the Big Bang.

Warlock chose her out of personal affection, as well as the knowledge that, as one of the galaxy's most capable warriors, she would be able to defend the gem from potential thieves.

After he learns of this, Fett decides not to kill Jacen in vengeance, but rather, as he sees Jacen falling to the dark side with his actions against Coruscant's Corellians, the galaxy's greatest bounty hunter figures that it would hurt Jacen more to let him live ; by falling to the dark side as he is, and just like his late grandfather Darth Vader had, letting him live long enough to fall to the dark side will have Jacen see his friends and family turn on him in the future.

It is passing behind M51 and may be the cause of the larger galaxy's prodigious star formation.

This discrepancy can be accounted for by a large amount of dark matter that permeates the galaxy and extends into the galaxy's halo.

These intergalactic H II regions may be the remnants of tidal disruptions of small galaxies, and in some cases they may represent a new generation of stars in a galaxy's most recently accreted gas.

Astronomers first began to suspect that the Milky Way is a barred spiral galaxy in the 1990s .< ref > Their suspicions were confirmed by the Spitzer Space Telescope observations in 2005 which showed the galaxy's central bar to be larger than previously suspected.

In physical cosmology, the term peculiar velocity ( or peculiar motion ) refers to the components of a receding galaxy's velocity that cannot be explained by Hubble's law.

The expansion of space causes the spectra of these galaxies to be shifted, depending on the distance, and modified by the doppler effect of the galaxy's radial velocity.

Chibapiano residents-These aliens are large, slug-like aliens which move, speak, and even think slower than the rest of the galaxy's creatures because they appear to be imprinted with such a slowness in their DNA.

This interstellar dust is found primarily within the galaxy's spiral arms, and it has been shown to be associated with star formation regions.

Consequently, the galaxy's spiral arms appear to be smooth and featureless, rather than knotted like galaxies with extended star formation., which justifies why this galaxy, along with NGC 4921 in the Coma Cluster has been classified as the prototype of an anemic galaxy.

The HST image of NGC 3982 shows a mini-spiral between the circumnuclear star-forming region and the galaxy's nucleus, which could be the channel through which gas is transported to the supermassive black hole from the star-forming region.

Globular clusters thought to be associated with the Canis Major Dwarf galaxy include NGC 1851, NGC 1904, NGC 2298 and NGC 2808, all of which are likely to be remnants of the galaxy's globular cluster system before its accretion, or swallowing, into the Milky Way.

The Phil Foglio comics based on the books also involve The Winslow: A small fuzzy alligator which happens to be utterly indestructible and presumably immortal, and figures prominently one way or another into fully three-fourths of the galaxy's known religions.

Although they turn down his offer, afterwards Teyla expresses to Ronon that working with the Genii might be the galaxy's best hope without the Atlantis Expedition.

Scientists considered the possibility that particular areas of galaxies ( galactic habitable zones ) are better suited to life than others ; the Solar System in which we live, in the Orion Spur, on the Milky Way galaxy's edge is considered to be in a life-favorable spot:

It is one of the largest H II regions in the Local Group of galaxies ; at the galaxy's estimated distance of 2. 7 million light-years its longest diameter is roughly 1500 light-years ( 460 parsecs ), over 40 times the size of the visible portion of the Orion Nebula.

Davros, which does not feature the Daleks, apparently fills in the gaps between Resurrection of the Daleks and Revelation of the Daleks, and has the scientist trying to manipulate the galaxy's economy into a war footing similar to Skaro's.

He is also mistakenly credited with the discovery of the existence of galaxies other than the Milky Way and his galactic red shift discovery that the loss in frequency — the redshift — observed in the spectra of light from other galaxies increased in proportion to a particular galaxy's distance from Earth.

Using the data collected by Vesto Slipher and his ( Hubble's ) assistant Milton Humason ( a former mule-driver and janitor ), Hubble and Humason found a direct relationship between a galaxy's distance and its relative speed away from the solar system.

Examples of galaxies range from dwarfs with as few as ten million ( 10 < sup > 7 </ sup >) stars to giants with a hundred trillion ( 10 < sup > 14 </ sup >) stars, each orbiting their galaxy's own center of mass.

Within a billion years of a galaxy's formation, key structures begin to appear.

This demonstrates how many of this galaxy's globular clusters might have been acquired in the past.

* The Milky Way is rotating around its dense galactic center, thus the sun is moving in a circle within the galaxy's gravity.

File: Edwin Hubble with pipe. jpg | Edwin Hubble ( 1889-1953 ): discovered of the existence of galaxies other than the Milky Way and galactic red shift, found that the loss in frequency — the redshift — observed in the spectra of light from other galaxies increased in proportion to a particular galaxy's distance from Earth: Hubble's law

Typical galaxies range from dwarfs with as few as ten million ( 10 < sup > 7 </ sup >) stars up to giants with one trillion ( 10 < sup > 12 </ sup >) stars, all orbiting the galaxy's center of mass.

He also discovers that Vader is still alive after seeing him on the Holonet, the galaxy's official news source.

When the Foundation comes to realize that The Mule was not foreseen in Seldon's plan, and there is no predicted way of defeating him, Toran and Bayta Darell, accompanied by Ebling Mis — the galaxy's current greatest psychologist — and a street clown named Magnifico ( whom they agree to protect, as his life is under threat from the Mule himself ) set out to find the Second Foundation, hoping they bring an end to the Mule's reign.

As usual on spiral galaxies of the Virgo Cluster, in the rest of the disk both star formation and neutral hydrogen, of which M100 is deficient compared to isolated spirals of similar Hubble type, are truncated within the galaxy's disk, something caused by interactions with the intracluster medium of Virgo.

This discovery increased the estimate of the galaxy's size to 100, 000 light years, with the sun replaced to a distance of 30, 000 light years from the galactic center.

M64 ( NGC 4826 ) is known as the Black Eye Galaxy because of the prominent dark dust lane in front of the galaxy's bright nucleus.

Thus the amplitude of the galaxy rotation curve is related to the galaxy's visible mass.

They suggested that the spiral arms were manifestations of spiral density waves, attempting to explain the large-scale structure of spirals in terms of a small-amplitude wave propagating with fixed angular velocity, that revolves around the galaxy at a speed different from that of the galaxy's gas and stars.

* North Polaris: Santa Claus's planet, populated by " Elf-G-M " s. The galaxy's version of the North Pole.

He left the hospital 65 % cyborg, walked out on his wife, and formed a mercenary team, " Xris's Commandos ," during which time he came to the attention of a number of the galaxy's more prominent military officers — Warlord Derek Sagan, General ( and later Lord of Admiralty ) John Dixter, and the Lady Maigrey Morianna, who hired him for an invasion of Corasian space ( a feat never before attempted due to its suicidal nature ).

It is a time that tests the mettle of all those who strive to hold the Republic together — none more so than the Jedi Knights, who have long been the galaxy's best hope for preserving peace and justice.