Lecture
This lecture covers the groundbreaking observations made by the Hubble Space Telescope, such as the Hubble Deep Field and Ultra Deep Field, shedding light on the early universe. It explains the concept of redshift and its relation to the age of the universe, as well as the future James Webb Space Telescope. The lecture also delves into the different components and densities of the universe, the use of cepheid stars for distance measurement, and the significance of type Ia supernovae in cosmology.