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The coolest main sequence star known as of 2023. Coolest giant stars ... If it is a binary, its components could be as cold as about 275-350 K. [16]
It is the coldest known neutron star with a surface temperature less than 42000 Kelvin as measured by the Hubble Space Telescope. [1] It was previously thought to have a period of 2.84 seconds but is now known to have a period of 8.51 seconds, which is among the longest-known radio pulsar.
For a dim star like TRAPPIST-1, the habitable zone [ah] is located closer to the star than for the Sun. [164] Three or four [59] planets might be located in the habitable zone; these include e, f and g; [164] or d, e and f. [79] As of 2017, this is the largest-known number of planets within the habitable zone of any known star or star system. [165]
A star is a massive luminous spheroid astronomical object made of plasma that is held together by its own gravity.Stars exhibit great diversity in their properties (such as mass, volume, velocity, stage in stellar evolution, and distance from Earth) and some of the outliers are so disproportionate in comparison with the general population that they are considered extreme.
The age of the oldest known stars approaches the age of the universe, about 13.8 billion years. Some of these are among the first stars from reionization (the stellar dawn), ending the Dark Ages about 370,000 years after the Big Bang. [1] This list includes stars older than 12 billion years, or about 87% of the age of the universe.
This category of dwarf stars was introduced in 1997 by J. Davy Kirkpatrick, Todd J. Henry, and Michael J. Irwin. It originally included very low mass M-dwarf stars with spectral types of M7 but was later expanded to encompass stars ranging from the coldest known to brown dwarfs as cool as spectral type T6.5.
Lies within the Alpha Centauri star system [9] Barnard's Star: Named after its discoverer, E. E. Barnard: Second closest neighbouring star system to Earth, after α Cen. Also the star with the highest proper motion. [14] van Biesbroeck's star: Named for its discoverer, George van Biesbroeck: Was once the least luminous, and, lowest mass, known ...
This is a list of astronomical objects with the spectral type Y.They are a mix of brown dwarfs and planetary-mass objects.They are the coldest such objects in interstellar space and have a temperature around below 500 Kelvin (227°C; 440°F).