Search results
Results from the WOW.Com Content Network
The radius of the observable universe is therefore estimated to be about 46.5 billion light-years. [8] [9] Using the critical density and the diameter of the observable universe, the total mass of ordinary matter in the universe can be calculated to be about 1.5 × 10 53 kg. [10]
Distance measures are used in physical cosmology to give a natural notion of the distance between two objects or events in the universe.They are often used to tie some observable quantity (such as the luminosity of a distant quasar, the redshift of a distant galaxy, or the angular size of the acoustic peaks in the cosmic microwave background (CMB) power spectrum) to another quantity that is ...
Because humans cannot observe space beyond the edge of the observable universe, it is unknown whether the size of the universe in its totality is finite or infinite. [ 3 ] [ 57 ] [ 58 ] Estimates suggest that the whole universe, if finite, must be more than 250 times larger than a Hubble sphere . [ 59 ]
The smallest such d is called the diameter of the universe, ... [17] and an optimal orientation on the sky for the model was estimated in 2008. [10]
IC 1101 is a class S0 supergiant lenticular galaxy at the center of the Abell 2029 galaxy cluster.It has an isophotal diameter at about 123.65 to 169.61 kiloparsecs (400,000 to 550,000 light-years).
The Milky Way is a barred spiral galaxy with a D 25 isophotal diameter estimated at 26.8 ... as old as the Universe itself and thus ... ± 6 km/s (1,235,000 ± ...
1.4 km – diameter of Dactyl, the first confirmed asteroid moon; 4.8 km – diameter of 5535 Annefrank, an inner belt asteroid; 5 km – diameter of 3753 Cruithne; 5 km – length of PSR B1257+12; 8 km – diameter of Themisto, one of Jupiter's moons; 8 km – diameter of the Vela Pulsar; 8.6 km – diameter of Callirrhoe, also known as ...
It represents the boundary between the observable and the unobservable regions of the universe, so its distance at the present epoch defines the size of the observable universe. Due to the expansion of the universe, it is not simply the age of the universe times the speed of light, as in the Hubble horizon, but rather the speed of light ...