Structure of the Universe Part 1

Are made up of gas, dust, and billions of stars and have different shapes 

• Universe
• Nebula
• Galaxy
• Star

The distance light travels in one year.

• Light Year
• Length
• Space Tools
• Telescope

A luminous sphere of plasma held together by its own gravity.

• Sun
• Star
• Nebula
• Galaxy

Is all of time and space and its contents. It includes planets, moons, minor planets, stars, galaxies, and other celestial bodies.  

• Galaxy
• Space
• Universe
• Solar System

Is an unidentified type of matter comprising approximately 27% of the mass and energy in the observable universe that is not accounted for by dark energy, baryonic matter (ordinary matter), and neutrinos.

• MATTER
• DARK ENERGY
• DARK MATTER
• ENERGY

A cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch 

• STAR
• GALAXY
• UNIVERSE
• NEBULA

Is a method of measuring the distance to nearby objects in space

• SPACE TOOL
• LIGHT YEAR
• PARALLAX
• TELESCOPE

 A theory in astronomy: the universe originated billions of years ago in an explosion from a single point of nearly infinite energy density

• SPACE THEORY
• BIG BANG THEORY
• GALAXY FORMATION
• UNIVERSE THEORY

Is an unknown form of energy which is hypothesized to infuse all of space, tending to accelerate the expansion of the universe. Roughly 73% of the Universe.

• DARK ENERGY
• DARK MATTER
• ENERGY
• MATTER

A shift toward longer wavelengths of the spectral lines emitted by a celestial object that is caused by the object moving away from the earth.

• BLUE SHIFT
• EXPANSION
• CONTRACTION
• RED SHIFT