Explain the need to postulate the existence of dark matter in the universe.
Dark matter is a hypothetical type of matter distinct from ordinary matter such as protons, neutrons, electrons, and neutrinos.
Dark matter has never been directly observed; however, its existence would explain a number of otherwise puzzling astronomical observations.[1][2] The name refers to the fact that it does not emit or interact with observable electromagnetic radiation, such as light, and is thus invisible to the entire electromagnetic spectrum.
Although dark matter has not been directly observed, its existence and properties are inferred from unexplained mass in gravitational lensing calculations, which affects the motions of baryonic matter and light.[4]. It influences the universe's large-scale structure, the formation of galaxies, and affects the cosmic microwave background.
The standard model of cosmology indicates that the total mass–energy of the universe contains 4.9% ordinary matter, 26.8% dark matter and 68.3% dark energy Thus, dark
_____ ______ __________ ___ ______ ______ ____ ________ ________.
_____ _______ __________ _____ ____ ____ ___ ______.
_________ ___ _________ _________ __________ ___ ________ ___ ________ ________ _______ __________.
______ ______ ___ ________ ________ _______ ____ _______ ______ __________ ____ _____.
______ ______ _____ ___ ________.
___ ___ ______ ____ _____ __________ ________ ______.
__________ _______ _______ ________ __________ ______ ___ _______ _____ ______ _______ ___.
______ __________ ____ ____ ____ _______.
_____ ___ _____ ________ _____.
__________ ___ _______ __________ _________ _____.
___ __________ __________ ___ ___ _________.
______ ______ _______ _________ ________ ________ _________ ______.
___ ________ ___ ______ __________ ____ ________ _______ ______ ________ ____.
______ _____ ________ _________ __________ ____ _________ _______ _________ __________ _________.
_________ ________ _________ _______ ___ __________ _________.
________ ________ _____ ______ ________ _______ _______ ___ _________ ____ ____.
_______ ________ __________ _____ _____ _____ ___ _________ _________ _________.
_____ ______ _____ _____ _________ ___ _________ ______ ______ ___ __________ ___.
__________ _________ _______ _________ ____ _________ ____.
____ ________ __________ ____ ______ ______ _______ _____ _________.
_____ __________ ____ _________ __________ __________ _______ ___ ______ _____ _____.
___ _________ _____ _______ ____ ________ _________ __________ ________.
_________ ________ ________ _____ _________ ____ ______ _________ _____ ________.
___ ____ _______ ______ _______ ______ ________.
________ ______ __________ _____ ___ _____ __________ _____ ________.
____ _____ ____.
- Solved Assignments
- Study Notes
- Guess Papers
- Question Papers
✓ Unlock up to 60% of the answer
✓ No payment required