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NGC 7538, near the more famous Bubble Nebula, is located in the constellation Cepheus. It is located about 9,100 light-years from Earth. It is home to the biggest yet discovered protostar which is about 300 times the size of the Solar System. [4] It is located in the Perseus Arm of the Milky Way and is probably part of the Cassiopeia OB2 ...
Despite the uncertainty of the planet's properties, a 2017 study calculated HD 100546 b as a very highly reddened substellar object with a good-fit effective temperature of 2,630 K and a planetary mass and radius of 25 M Jup and 3.4 R Jup, making it still one of the largest exoplanets discovered by size. [27]
HOPS 383 is a Class 0 protostar. It is the first Class 0 protostar discovered to have had an outburst, [1] and as of 2020, the youngest protostar known to have had an outburst. [1] The outburst, discovered by the Herschel Orion Protostar Survey (HOPS) team, was first reported in February 2015 in The Astrophysical Journal Letters. [2]
The protostar, called HH 30, is what's known in astronomy as a Herbig-Haro object – a bright patch of cosmic emission associated with newborn stars. The Hubble Space Telescope was the first to ...
The nebula NGC 7538 is home to the largest-yet-discovered protostar. [27] NGC 7023 is a reflection nebula with an associated star cluster (Collinder 429); it has an overall magnitude of 7.7 and is 1,400 light-years from Earth. The nebula and cluster are located near Beta Cephei and T Cephei. [28]
A protostar is a very young star that is still gathering mass from its parent molecular cloud. It is the earliest phase in the process of stellar evolution . [ 1 ] For a low-mass star (i.e. that of the Sun or lower), it lasts about 500,000 years. [ 2 ]
Astronomers have long hypothesized that as a protostar grows to a size beyond 120 M ☉, something drastic must happen. [2] Although the limit can be stretched for very early Population III stars, and although the exact value is uncertain, if any stars still exist above 150–200 M ☉ they would challenge current theories of stellar evolution .
These lists contain the Sun, the planets, dwarf planets, many of the larger small Solar System bodies (which includes the asteroids), all named natural satellites, and a number of smaller objects of historical or scientific interest, such as comets and near-Earth objects.