Observable Universe

The observable Universe is the furthest we can see with the largest telescopes, because light (or other signals) from those objects has had time to reach us.

Universe - facts 7

The diameter of the observable Universe is currently estimated to be 93 billion light years. This is approximately 558,000,000,000,000,000,000,000 miles (558 sextillion miles).

Velocity

Velocity is how fast an object is moving in a given direction.

Galaxies - facts 8

Some galaxies are as far as 13 billion light years away from us.

Galaxy

A galaxy is made up of a massive amount of gas, dust, stars, planets, and other objects. They are held together by their own gravity.

Homogeneously

Homogeneously means that the matter in the Universe is spread uniformly when averaged over large distances.

Extrasolar planet

An extrasolar planet is a planet that is outside the Solar System.

Super-Earth

A super-Earth is an extrasolar planet that has a mass higher than Earth's but less than the gas giants in the Solar System.

Quasar

A quasar is a very distant object that is extremely luminous and looks star-like in appearance.

Supercluster

A supercluster is a very large group of galaxy clusters.

Space time

Space time is space and time existing together in the Universe.

Absolute zero

Absolute zero is the lowest theoretical temperature possible. It is 0 on the Kelvin scale. This is -459.67 degrees Fahrenheit or -273.15 degrees Celsius.

Jupiter - trivia 3

1) In what direction does the Great Red Spot on Jupiter rotate?

a) clockwise
b) counterclockwise
c) stationary

Check comments for the answer.

Cosmic microwave background radiation

Cosmic microwave background radiation is radiation that fills the entire Universe, believed to be left over from the Big Bang.

Intergalactic space

Intergalactic space is the space between galaxies.

Elementary particle

An elementary particle is a particle that cannot be subdivided into anything smaller.