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The comoving distance from Earth to the edge of the observable universe is about 14.26 gigaparsecs (46.5 billion light-years or 4.40×10 m) in any direction. The observable universe is thus a sphere with a diameter of about 28.5 gigaparsecs (93 billion light-years or 8.8×10 m). Assuming that space is roughly flat (in … 展开
Number of galaxies and stars
The observable universe contains as many as an estimated 2 trillion galaxies and, overall, as many as … 展开The most distant astronomical object identified (as of August of 2024) is a galaxy classified as JADES-GS-z14-0. In 2009, a gamma ray burst, GRB 090423, was found to have a redshift of 8.2, which indicates that the collapsing star that caused it exploded when … 展开
Both popular and professional research articles in cosmology often use the term "universe" to mean "observable universe". This can be justified on the grounds that we can never know anything by direct observation about any part of the universe that is 展开
Sky surveys and mappings of the various wavelength bands of electromagnetic radiation (in particular 21-cm emission) have yielded much … 展开
• Bolshoi cosmological simulation – Computer simulation of the universe
• Causality (physics) – Physics of the cause–effect relation
• Chronology of the universe – History and future of the universe 展开CC-BY-SA 许可证中的维基百科文本 Cosmic Distances - Science@NASA
2020年5月18日 · Distances between the planets, and especially between the stars, can become so big when expressed in miles and kilometers that they're unwieldy. So for cosmic distances, we switch to whole other types of units: …
What is the Universe? - NASA Science
Universe - Wikipedia
Of the four fundamental interactions, gravitation is the dominant at astronomical length scales. Gravity's effects are cumulative; by contrast, the effects of positive and negative charges tend to cancel one another, making electromagnetism relatively insignificant on astronomical length scales. The remaining two interactions, the weak and strong nuclear forces, decline very ra…
Wikipedia · CC-BY-SA 许可下的文字Units for Distance and Size in the Universe
An astronomical unit is the average distance between the Earth and the Sun: 1 AU = 1.496 x 10 8 km = 93 million miles. Jupiter is about 5.2 AU from the Sun and Pluto is about 39.5 AU from …
Imagine the Universe!
2020年10月22日 · Why Are These Distances Important To Astronomers? Scientists have estimated the age of the Universe to be 13.73 billion years old (with an uncertainty of about 120 million years). When we observe an object …
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How can the visible universe be 46 billion light-years in …
2024年6月12日 · The expansion of the universe explains how it can be so much larger than 13.8 billion light-years across.
the distance to the stars, we will begin to see what the universe looks like in three dimensions, and we will begin to answer some of the greatest of questions: How old is the universe? Is it …
A small comoving distance DC between two nearby objects in the Universe is the distance between them which remains constant with epoch if the two objects are moving with the …
How Big is the Universe? - Space Tonight
The observable universe, the part of the universe that we can see, is approximately 93 billion light years in diameter. This means that the distance between us and the edge of the observable universe is about 46.5 billion light …
