The Observable Universe
Number of Galaxies: Current estimates suggest there are at least 2 trillion galaxies in the observable universe.
Age of the Light: The farthest objects we see emitted their light over 13 billion years ago, but due to the expansion of the universe, they are now over 46 billions light-years away.
OBSERVABLE UNIVERSE COMPARED TO ENTIRE UNIVERSE:
The observable universe is limited by how far light has traveled since the Big Bang—about 13.8 billion years. This forms a boundary of about 46.5 billion light-years in every direction. However, the entire universe could be much larger or even infinite. Beyond the observable universe lies space we cannot see because its light hasn’t had time to reach us. While we can map galaxies, stars, and cosmic structures within the observable universe, the entire universe may contain vastly more galaxies, or even regions with different physical properties and laws. We can only hypothesize about these regions based on current cosmological models.
KEY FACTS:
• Mass: Estimated at about 1.5 x 10⁵³ kg (including dark matter)
• Density: Roughly 9.9 x 10 raise to negative 30 grams per cubic centimeter
• Diameter: Around 93 billion light-years (across)
• Volume: About 4 x 10³² cubic light-years
• Contents: Galaxies, stars, planets, dark matter, dark energy, intergalactic gas, cosmic microwave background radiation (CMB)
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Pic 1 Source: https://images.app.goo.gl/oKuJ8nC88hVUR44d8
Pic 2 Source: https://images.app.goo.gl/LwM1ViiAzE5crxKh7
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