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A galaxy color–magnitude diagram showing the red sequence (old galaxies, typically elliptical galaxies), the green valley (where the Milky Way is believed to be in), and the blue cloud (young galaxies, typically spiral galaxies).
In physical cosmology, the age of the universe is the time elapsed since the Big Bang.Astronomers have derived two different measurements of the age of the universe: [1] a measurement based on direct observations of an early state of the universe, which indicate an age of 13.787 ± 0.020 billion years as interpreted with the Lambda-CDM concordance model as of 2021; [2] and a measurement based ...
This article is missing information about the age of the very oldest stars in our galaxy's bulge such as from the Gaia spacecraft. Please expand the article to include this information. Further details may exist on the talk page. (June 2018)
A galaxy is a system of stars, ... Our own galaxy, ... Each light speck is a galaxy, some of which are as old as 13.2 billion years ...
The thin disk of our galaxy began to form at about 5 billion years (8.8 Gya), [12] and the Solar System formed at about 9.2 billion years (4.6 Gya), with the earliest evidence of life on Earth emerging by about 10 billion years (3.8 Gya).
Scientists say there's a 50/50 chance that our Milky Way galaxy will collide with the Andromeda galaxy, challenging previous certainty about this cosmic event.
“Even in our Milky Way galaxy we do not have such image.” Massive stars have shorter lives than less massive ones. For instance, the sun is already more than 4.5 billion years old and has ...
The galactic year, also known as a cosmic year, is the duration of time required for the Sun to orbit once around the center of the Milky Way Galaxy. [1] One galactic year is approximately 225 million Earth years. [2]