Dark Energy

Dark Matter

Gravitational Waves

Cosmic Microwave Background

10^-30 g/cm^3

10^-27 g/cm^3

10^-24 g/cm^3

10^-21 g/cm^3

w = -1

w = 0

w = 1

w = 2

A constant energy density that permeates the universe

A constant curvature of the universe

A constant rate of expansion of the universe

A constant temperature of the universe

The universe will continue to expand forever

The universe will eventually reach a maximum size and then collapse

The universe will eventually stop expanding and reach a steady state

The universe will eventually tear itself apart

The observed acceleration of the universe's expansion

The cosmic microwave background radiation

The abundance of light elements in the universe

The existence of supernovae

Dark energy and dark matter are the same thing

Dark energy and dark matter are completely unrelated

Dark energy is a component of dark matter

Dark matter is a component of dark energy

Scientists are working to better understand the properties of dark energy

Scientists are working to develop new theories to explain dark energy

Scientists are working to find ways to detect dark energy directly

All of the above

Dark energy is very difficult to detect directly

Dark energy is very difficult to model theoretically

Dark energy is very difficult to distinguish from other cosmological phenomena

All of the above

A cosmological constant

A scalar field

Modified gravity theories

All of the above

The cosmological constant is a specific type of dark energy

The cosmological constant is the only type of dark energy

The cosmological constant is not related to dark energy

The cosmological constant is a competing theory to dark energy

Dark energy is the same thing as vacuum energy

Dark energy is a component of vacuum energy

Vacuum energy is a component of dark energy

Dark energy and vacuum energy are unrelated

Dark energy is responsible for the acceleration of the universe's expansion

Dark energy is responsible for the deceleration of the universe's expansion

Dark energy has no effect on the universe's expansion

Dark energy is responsible for the universe's expansion

Dark energy will eventually cause the universe to expand forever

Dark energy will eventually cause the universe to collapse

Dark energy will eventually cause the universe to reach a steady state

Dark energy will eventually cause the universe to tear itself apart