Question

Lesson 4: Theories about the Universe
Word Bank-you may use a word more than once.

Element

same

sun

Geocentric

Andromeda

telescope

math

gravity

out

radiation

older

single

Heliocentric

Edwin Hubble, in 1923, discovered the blank Galaxy. He thought he was looking at a gas cloud, but in the photographs he saw faint stars. He then concluded the blank is full of galaxies. He discovered almost all galaxies are moving from each other. Hubble discovered the galaxies are moving away from each other by analyzing blank the emitted by galaxies. The farther away a galaxy, the faster it is moving. White light includes all colors of light. This blend of light is called a blank When the light passes through a prism it separates the colors into different wavelength/color bands. It separates colors from lowest frequency (red) to highest frequency (violet). Each blank creates its own pattern of dark lines, similar to an individual's Fingerprints. Hydrogen looks different than helium. Astronomers use the lines to determine the elements in a star.

Answer 1

Edwin Hubble, in 1923, discovered the **Andromeda** Galaxy. He thought he was looking at a gas cloud, but in the photographs, he saw faint stars. He then concluded the **universe** is full of galaxies. He discovered almost all galaxies are moving from each other. Hubble discovered the galaxies are moving away from each other by analyzing **radiation** emitted by galaxies. The farther away a galaxy, the faster it is moving. White light includes all colors of light. This blend of light is called a **spectrum**. When the light passes through a prism, it separates the colors into different wavelength/color bands. It separates colors from the lowest frequency (red) to the highest frequency (violet). Each **element** creates its own pattern of dark lines, similar to an individual's fingerprints. Hydrogen looks different than helium. Astronomers use the lines to determine the elements in a star.