An expanding universe typically has a finite age. Light, and other particles, can have propagated only a finite distance. The comoving distance that such particles can have covered over the age of the universe is known as the particle horizon, and the region of the universe that lies within our particle horizon is known as the observable universe.
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Moving forward, it's essential to keep these visual contexts in mind when discussing Expanded Spaces.
Learn about a new mission seeking to understand some of the greatest mysteries of our universe, and explore hands-on teaching resources that bring it all down to Earth.

Such details provide a deeper understanding and appreciation for Expanded Spaces.
Expanding universe, dynamic state of the extragalactic realm, the discovery of which transformed 20th-century cosmology. The development of general relativity and its application to cosmology, along with the detection of extragalactic redshift, led to the realization in the 1920s that all galaxies are receding.
The expansion of the Universe is know, but how much do we know about this process? Answers to questions about the expansion of the Universe.