This object is fusing Hydrogen into Helium about 93 million miles from Earth

If two objects are of equal size, but different weight, this one is less dense

The distance that light can travel in a year

The first stars formed when huge clouds of this were pulled together by their own gravity

The accepted theory about how the Universe began

The word for the sum of everything that exists

These two things are required to calculate the density of a substance

The distance from the Sun to the Earth

Inside the core of a star, there is enough heat and pressure to combine lighter elements into heavier ones via this process

A single infinitely dense, infinitely hot point that everything expanded outward from

A collection of billions of stars, solar systems, and nebulae

You could make something more dense by doing this

The approximate width of our galaxy

The part of a star’s life when it is fusing hydrogen into helium in its core

There were no atoms of elements at first, but when protons began to capture electrons this element was formed

A star and everything that is orbiting around it

The density of water

The approximate distance to the nearest star to our Sun

When our star's core has run out of Hydrogen, it will begin fusing Helium and swell outward, becoming this

Other galaxies are moving away from us, as evidenced by this distortion of light

A cloud of dust and gas which can be the birthplace of stars, or the remnants of a dead one

A 15 pound bowling ball that has a volume of 5 liters has this density

The approximate travel time for one of our space probes to reach the nearest star to our Sun

Supermassive stars created all the heavy elements in the Universe, when they did this at the end of their life cycles

Leftover heat and energy from the Big Bang can still detected as this