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2020 — Astronomers report to have discovered the disk galaxy Wolfe Disk, dating back to when the universe was only 1.5 billion years old, possibly indicating the need to revise theories of galaxy formation and evolution. [33] [34] [35] [36]
The reason is that these galaxy formation models predict a large number of mergers. If disk galaxies merge with another galaxy of comparable mass (at least 15 percent of its mass) the merger will likely destroy, or at a minimum greatly disrupt the disk, and the resulting galaxy is not expected to be a disk galaxy (see next section).
The thin disk of our galaxy began to form at about 5 billion years (8.8 Gya), [13] and the Solar System formed at about 9.2 billion years (4.6 Gya), with the earliest evidence of life on Earth emerging by about 10 billion years (3.8 Gya).
The Sculptor Galaxy (NGC 253) is a disk galaxy. A disc galaxy (or disk galaxy) is a galaxy characterized by a galactic disc. This is a flattened circular volume of stars that are mainly orbiting the galactic core in the same plane. [1] These galaxies may or may not include a central non-disc-like region (a galactic bulge). [2]
The star is surrounded by a disk where planets may form. Astronomers have spotted a massive young star in a neighboring galaxy called the Large Magellanic Cloud. The star is surrounded by a disk ...
The Sculptor Galaxy (NGC 253) is an example of a disc galaxy. A galactic disc (or galactic disk) is a component of disc galaxies, such as spiral galaxies like the Milky Way and lenticular galaxies. Galactic discs consist of a stellar component (composed of most of the galaxy's stars) and a gaseous component (mostly composed of cool gas and dust).
The star, growing and accreting material from the surrounding disk, is about 10 to 20 times more massive than the sun and perhaps 10,000 times more luminous. In a first, a newborn star's spinning ...
REBELS-25 is a massive, star-forming rotating disc galaxy [1] [2] with a redshift of 7.31. [3] It was discovered using the Atacama Large Millimeter/submillimeter Array (ALMA), [4] [5] notice of its discovery was published in the Monthly Notices of the Royal Astronomical Society. REBELS-25 existed just 700 million years after the Big Bang.