The Milky Way is a large barred spiral galaxy, roughly 100,000–200,000 light-years across, containing 100–400 billion stars, including our Sun. Earth sits about 25,000 light-years from the center, which hosts a supermassive black hole, Sagittarius A*. It is part of the Local Group and is roughly 13.6 billion years old.
Key Facts About the Milky Way:
Structure: Comprised of a central bulge, a flat rotating disk with spiral arms, and a faint spherical halo.
Solar Location: The Sun is located in the Orion Spur, one of the spiral arms, orbiting the center every 240 million years.
Appearance: From Earth, it appears as a bright, irregular band stretching across the night sky, known in Chinese as the "Silver River" and Southern Africa as the "Backbone of Night".
Composition: Contains hundreds of billions of stars, massive amounts of interstellar gas and dust, and roughly 59 known satellite galaxies.
Formation & Fate: Formed shortly after the Big Bang, the Milky Way grew by consuming smaller galaxies. It is currently on a collision course with the Andromeda Galaxy, which will eventually merge with it.
Star Formation: While it still produces stars, the rate of star formation is slowing down, leading scientists to believe it may eventually stop forming new stars.
It is just one of billions of galaxies, but the Milky Way is our galaxy, our home in the universe. Our galaxy, the Milky Way, contains a supermassive black hole at its core, surrounded by a central bulge of old, yellow stars. Beyond that, young blue stars spiral out from the center, filled in with dark lanes of dust.
Galaxies form through the growth of very small seeds, so only a small fraction of the Milky Way's stars formed during those earliest phases. Astronomers believe that these rare stars formed in small, early galaxies and globular clusters, which later merged together as the Milky Way grew.
The Milky Way galaxy is known as Akash Ganga in India. Translated from Sanskrit, this name means "Ganges of the Sky" or "the heavenly river of light," as ancient observers imagined the band of stars as a celestial river.
The Milky Way is visible from many countries, primarily in areas with minimal light pollution and high elevation, with the best views in the Southern Hemisphere. Prime locations include Chile (Atacama Desert), Namibia (Namib Desert), New Zealand, Australia, and India (Hanle, Ladakh).
The oldest known star in the universe with a determined age is HD 140283, commonly nicknamed the Methuselah star. Located about 190–200 light-years away in the constellation Libra, it is estimated to be over 12 billion years old, making it nearly as old as the universe itself, which is about 13.8 billion years old.
NASA Science (.gov)
NASA Science (.gov)
+3
Name: HD 140283 (Methuselah Star).
Age: Initially estimated at $\sim$14.4 billion years, refined studies suggest it is roughly 12 to 13.2 billion years old.
Significance: It is a metal-poor, subgiant star composed mostly of hydrogen and helium, suggesting it formed shortly after the Big Bang.
Observation: It is visible with binoculars (magnitude 7.2) and is part of the Milky Way's halo, a region containing some of the oldest stars.
YouTube
YouTube
+5
While early measurements created a "Methuselah Paradox" by making the star appear older than the universe, refined studies (such as those from NASA Science in 2013 and subsequent studies) have aligned its age with the current standard cosmological model.
YouTube
YouTube
+1
12:21
Methuselah Is No Longer the Oldest Star, Study Provides Explanation
YouTube·Anton Petrov
Hubble Finds Birth Certificate of Oldest Known Star - NASA Science
HD 140283 is an aging star that is the oldest known star in our solar neighborhood. It is located 190.1 light-years from Earth. The star's name translates to "M...
NASA Science (.gov)
HD 140283 - Wikipedia
HD 140283 (also known as the Methuselah star) is a metal-poor subgiant star about 200 light years away from the Earth in the constellation Libra, near the bound...
Wikipedia
What Were the First Stars Like? - NASA Science
The first stars must have been metal-free. Ancient star, but not one of the first: One of the oldest known stars ever observed is a subgiant star in the Milky W...
NASA Science (.gov)
0:48
The Oldest Star in The Universe
YouTube·Science Time
Methuselah: The oldest star in the universe | Space
The oldest star in the universe is HD140283 — or Methuselah as it's commonly known. This Digitized Sky Survey image shows Methuselah star, located 190.
Andomar
With a diameter of about 220,000 light years, Andromeda is more than double the size of our own galaxy and contains around 1 trillion stars. Historically, the galaxy was first documented in 964 CE by Persian astronomer Abd al-Rahman al-Sufi and later observed through a telescope in 1612.
zombie galaxy is a massive, "red and dead" elliptical galaxy that has ceased forming new stars but continues to drift through space, essentially appearing alive while its star-forming capabilities are already dead. These galaxies often come back to life sporadically, or exist in a "green valley" stage between active star-forming and fully dormant.
Astronomers have come up with two main hypotheses for galactic death: either the cold gas needed to produce new stars is suddenly 'sucked' out of the galaxies by internal or external forces, or the supply of incoming cold gas is somehow stopped, slowly strangling the galaxy to death over a prolonged period of time.
The ultramassive galaxy, known as XMM-2599, exploded with star formation before the universe was even 2 billion years old.Astronomers estimate there are roughly 200 sextillion stars in the observable universe. That's a 2 followed by 23 zeros.
Wearing the Galaxy skin may turn heads in Fortnite, but this other-worldly fashion statement comes with a cost. The skin is now only available to those who buy Samsung's Galaxy Note 9 or Tab S4 devices - US$1,299.99 and US$999.99 (November 2018).that is the fact of galaxy.milky way galaxy is mork Mistry way that scientifically approved by many scientists.