English Dark matter Cited by user P.Shiladitya on 23 Apr 2023 In astronomy, dark matter is a hypothetical form of matter that appears to not interact with light or the electromagnetic field.
English De Sitter universe Cited by user Fermiboson on 22 Nov 2022 A de Sitter universe is a cosmological solution to the Einstein field equations of general relativity, named after Willem de Sitter.