Hayat Ashraf

Dark matter and dark energy are two mysterious components that make up a significant portion of the universe's composition. Although they cannot be directly observed or detected using current technologies, their existence is inferred based on the observed effects they have on visible matter and the expansion of the universe. 1. Dark Matter: Dark matter refers to an invisible form of matter that does not interact with light or electromagnetic radiation. Its presence is inferred through its gravitational effects on visible matter and the large-scale structure of the universe. Here are some key points about dark matter: - Gravitational Effects: Dark matter exerts a gravitational pull on visible matter, such as stars and galaxies. It is believed to be responsible for holding galaxies and galaxy clusters together, preventing them from flying apart due to their observed rotational speeds. - Abundance: Dark matter is estimated to make up approximately 27% of the total matter-energy conten...