<![CDATA[ The local universe may be expanding more slowly than previously thought, a discovery that could relieve a pesky discrepancy known as the Hubble tension. ]]>
The Hubble constant is a value that describes the rate of expansion of the universe. It is determined by measuring the distance to galaxies and their redshift, which indicates how fast they are moving away from us. Discrepancies in its measurement have led to debates about the age and size of the universe.
The cosmic microwave background radiation (CMB) is the afterglow of the Big Bang, providing a snapshot of the universe when it was just 380,000 years old. It is a critical piece of evidence for the Big Bang theory and helps scientists understand the early universe's conditions.