- Cathcart is a census-designated place (CDP) in Snohomish County, Washington, United States. The population was 2,458 at the 2010 census. Based on per capita income, one of the more reliable measures of affluence, Cathcart ranks 45th of 522 areas in the state of Washington to be ranked. Cathcart was named for Isaac Cathcart, a lumberman, entrepreneur, and Snohomish County pioneer.
- Observable universe (Wikipedia)
The observable universe is a ball-shaped region of the universe comprising all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time; the electromagnetic radiation from these objects has had time to reach the Solar System and Earth since the beginning of the cosmological expansion. Initially, it was estimated that there may be 2 trillion galaxies in the observable universe. That number was reduced in 2021 to only several hundred billion based on data from New Horizons. Assuming the universe is isotropic, the distance to the edge of the observable universe is roughly the same in every direction. That is, the observable universe is a spherical region centered on the observer. Every location in the universe has its own observable universe, which may or may not overlap with the one centered on Earth.
