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The star is moving closer to the Sun with a radial velocity of −11 km/s, [5] and is traversing the sky with a relatively high proper motion of 0.271 arc seconds per year. [ 11 ] Eta Ursae Minoris is about one billion years old and has an estimated 1.35 times the mass of the Sun . [ 7 ]
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.
The Milky Way Galaxy has a diameter of 100,000–200,000 light-years and is estimated to contain 100–400 billion stars and at least that number of planets. The Solar System is located on the inner edge of one of the Milky Way's spiral arms, about 27,000 light-years from the Galactic Center , which the Sun orbits with a period of 240 million ...
Vega was the northern pole star around 12,000 BCE and will be so again around the year 13,727, when its declination will be +86° 14′. [19] Vega was the first star other than the Sun to have its image and spectrum photographed. [20] [21] It was one of the first stars whose distance was estimated through parallax measurements.
In cosmology, galaxy filaments are the largest known structures in the universe, consisting of walls of galactic superclusters.These massive, thread-like formations can commonly reach 50 to 80 megaparsecs (160 to 260 megalight-years)—with the largest found to date being the Hercules-Corona Borealis Great Wall at around 3 gigaparsecs (9.8 Gly) in length—and form the boundaries between voids ...
Astronomers have detected one of the most distant and energetic mysterious fast radio bursts in space, a millisecond-long blast of radio waves that traveled 8 billion years to reach Earth.
Based on results from the Gaia telescope's second data release from April 2018, an estimated 694 stars will approach the Solar System to less than 5 parsecs in the next 15 million years. Of these, 26 have a good probability to come within 1.0 parsec (3.3 light-years) and another 7 within 0.5 parsecs (1.6 light-years). [3]
the Bright one النير النّيّر Alpha Gruis: Alnasl: an-Naşl: the Blade النصل النَّصْل Gamma² Sagittarii: Alnilam: an-Niżm: the String of Pearls النظم النَّظْم Epsilon Orionis: Alnitak: an-Niṭāq: the Girdle (Orion's Belt) النطاق النِّطَاق Zeta Orionis: Alphard: al-Fard: the Solitary one ...