Looking at distant galaxies gives us strong proof for the Big Bang theory in a few important ways:
Redshift: When light from galaxies travels to us, it gets stretched because the universe is expanding. This stretching is called redshift. The farther away the galaxy is, the more its light gets redshifted. This shows that galaxies are moving away from us, which supports the idea that the universe is getting bigger since the Big Bang happened.
Cosmic Microwave Background (CMB): We can see a faint glow all over the universe, known as the CMB. This glow is like the leftover heat from the very early universe. It helps strengthen the Big Bang theory.
Lots of Light Elements: Scientists see that hydrogen, helium, and lithium are very common in the universe. This matches what we expect if the Big Bang created these elements in a process called nucleosynthesis.
All of these pieces of evidence put together show us that the universe started with a huge explosion and has been expanding ever since.
Looking at distant galaxies gives us strong proof for the Big Bang theory in a few important ways:
Redshift: When light from galaxies travels to us, it gets stretched because the universe is expanding. This stretching is called redshift. The farther away the galaxy is, the more its light gets redshifted. This shows that galaxies are moving away from us, which supports the idea that the universe is getting bigger since the Big Bang happened.
Cosmic Microwave Background (CMB): We can see a faint glow all over the universe, known as the CMB. This glow is like the leftover heat from the very early universe. It helps strengthen the Big Bang theory.
Lots of Light Elements: Scientists see that hydrogen, helium, and lithium are very common in the universe. This matches what we expect if the Big Bang created these elements in a process called nucleosynthesis.
All of these pieces of evidence put together show us that the universe started with a huge explosion and has been expanding ever since.