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The observable universe contains as many as an estimated 2 trillion galaxies [36] [37] [38] and, overall, as many as an estimated 10 24 stars [39] [40] – more stars (and, potentially, Earth-like planets) than all the grains of beach sand on planet Earth. [41] [42] [43] Other estimates are in the hundreds of billions rather than trillions.
Galaxies can consist of millions to trillions of stars. The galaxy we live in is called the Milky Way, and astronomers estimate it has between 200-400 billion stars. The spiral arms of the Milky ...
[1] [13] However, more recent models of its stellar evolution have suggested revision of the star's age to 13.7 billion years [14] or 12 billion years. [ 5 ] Dubbed the " Methuselah Star" by the popular press due to its age, [ 15 ] [ 16 ] the star must have formed soon after the Big Bang [ 1 ] and is one of the oldest stars known as of 2021. [ 5 ]
A red giant star with one of the largest ranges in brightness known of stars in the night sky visible to the unaided eye. Despite its large radius, it is less massive than the Sun. 119 Tauri (CE Tauri, Ruby Star) 587 – 593 [76] AD ρ Cassiopeiae: 564 ± 67 or 700 ± 112 [77] AD
This number is likely much higher, due to the sheer number of stars needed to be surveyed; a star approaching the Solar System 10 million years ago, moving at a typical Sun-relative 20–200 kilometers per second, would be 600–6,000 light-years from the Sun at present day, with millions of stars closer to the Sun.
The list specifically excludes both white dwarfs – former stars that are now seen to be "dead" but radiating residual heat – and black holes – fragmentary remains of exploded stars which have gravitationally collapsed, even though accretion disks surrounding those black holes might generate heat or light exterior to the star's remains ...
Time until $1 trillion: 7 months. JPMorgan Chase (JPM) Market cap: $596 billion. Stock growth (3-year average growth): 10%. Time until $1 trillion: 5 years, 4 months. Walmart (WMT) Market cap ...
As a comparison, the neighboring Andromeda Galaxy contains an estimated one trillion (10 12) stars. [151] The Milky Way may contain ten billion white dwarfs, a billion neutron stars, and a hundred million stellar black holes. [f] [154] [155] Filling the space between the stars is a disk of gas and dust called the interstellar medium.