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According to observations utilizing adaptive optics to correct for Earth's atmospheric distortion, stars in the galaxy's bulge date to about 12.8 billion years old. [270] The age of stars in the galactic thin disk has also been estimated using nucleocosmochronology. Measurements of thin disk stars yield an estimate that the thin disk formed 8.8 ...
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae [1] and, as such, form part of the Hubble sequence. Most spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as the bulge.
These were later shown to be very important and were possibly related to star formation, observed kinematics, [3] stellar age, and even galaxy evolution in both spiral and elliptical galaxies. These three simple population classes usefully divided stars by their chemical composition or metallicity .
In addition, knowing the age of one member of a star system can help determine the age of that system. In a star system, stars almost always form at the same time as each other, and given the age of one star, the age of all of the others can be known. [14] However, this method does not work for galaxies. These units are much larger, and are not ...
Astronomers used NASA's James Webb Space Telescope to reveal 44 stars in a galaxy so far away, its light dates to when the universe was half its age. ... Dragon Arc's signature spiral into an ...
An analysis of the lightcurve of the microlensing event PA-99-N2 suggests the presence of a planet orbiting a star in the Andromeda Galaxy. [ 97 ] A controversial microlensing event of lobe A of the double gravitationally lensed Q0957+561 suggests that there is a planet in the lensing galaxy lying at redshift 0.355 (3.7 Gly).
The disk of A1689B11 is cool and thin, yet it produced stars at thirty times the rate of the Milky Way. With a lookback time (the difference between the age of the universe now and the age of the universe at the time light left the galaxy) of 11 billion years in the concordance cosmology, A1689B11 is forming 2.6 billion years after the Big Bang ...
It is commonly referred to as the oldest known grand design spiral galaxy in the universe, [2] but it is more accurately the earliest such galaxy known to exist in the universe, with a lookback time (the difference between the age of the universe now and the age of the universe at the time light left the galaxy [3]) of 10.7 billion years [1] in ...