1
Is the expansion rate of the universe slowing down or speeding up?
Speeding up
What pulls gas clouds together?
Gravity
What is it called when planets form around a star?
A solar system
What is the faint "echo" of light everywhere we see called?
Cosmic Microwave Background
Why could light not travel for the first 380,000 years?
It kept bumping into free electrons
Name the point on the Big Bang Timeline: Present time where stars are ignited and planets form.
The Era of Galaxies
Name the point on the Big Bang Timeline: Electrons join together with nuclei to form neutral atoms
The Era of Atoms
Name the point on the Big Bang Timeline: Orange fog (plasma ionized gas)
The Era of Nuclei
What are quarks?
The smallest know particles
What is the "stuff" that acts like "invisible glue", using it's gravity, to build galaxies?
Dark Matter
What is the event for when the universe cooled enough to settle down and form the first atoms?
Recombination