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Closest star to the Sun with exactly six [29] exoplanets, and closest K-type main sequence star to the Sun with a multiplanetary system. One of the oldest stars with a multiplanetary system, although it is still more metal-rich than the Sun. None of the known planets is in the habitable zone. [30] 61 Virginis: Virgo: 13 h 18 m 24.31 s: −18 ...
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.
TRAPPIST-1 TRAPPIST-1 is within the red circle in the constellation Aquarius. Observation data Epoch J2000 Equinox J2000 Constellation Aquarius Right ascension 23 h 06 m 29.368 s Declination −05° 02′ 29.04″ Apparent magnitude (V) 18.798 ± 0.082 Characteristics Evolutionary stage Main sequence Spectral type M8V Apparent magnitude (R) 16.466 ± 0.065 Apparent magnitude (I) 14.024 ± 0. ...
It is the most massive star that has a Bayer designation. It was only discovered to be (at least) two stars in the past few decades. Both the obscuring clouds and the great distances also make it difficult to judge whether the star is just a single supermassive object or, instead, a multiple star system. A number of the "stars" listed below may ...
A yellow hypergiant, one of the rarest types of stars. V838 Monocerotis: 464 [81] L/T eff: During the 2002 Red Nova, the star's radius may have increased up to 3,190 R ☉. [82] Pistol Star (V4647 Sagittarii) 420 [83] L/T eff: One of the most luminous stars known. La Superba (Y Canum Venaticorum) 344 [84] L/T eff: Mira (ο Ceti A) 332–402 [85] AD
Pictures show how the stars look during a period known as the cosmic noon - the middle ages of the universe when the most stars were born. ... is the period when the number of stars created in the ...
Most astronomers believe the universe is 13.7 billion years old. A new study says that figure could be closer to 26.7 billion.
If the universe is homogeneous at a large scale, then there would be four times as many stars in a second shell between 2,000,000,000 and 2,000,000,001 light years away. However, the second shell is twice as far away, so each star in it would appear one quarter as bright as the stars in the first shell.