Universe and Spectrum Flashcards
What is the difference between a galaxy & a nebula?
A galaxy is a collection of stars, gas, and dust held together by gravity. A nebula is smaller than a galaxy and is a large cloud of gas and dust.
Put the following terms in order from smallest to largest:
planet, nebula, solar system, galaxy, Local Group, Virgo Supercluster, universe
What inference about our universe do scientists make using evidence from the red-shift?
They can infer that the universe is expanding.
What type of rays does the Hubble telescope collect that allows us to learn about invisible aspects of our universe
Ultraviolet, near-infrared
List the spectrum from longest wavelength to shortest.
Radio, microwaves, infrared, visible, ultraviolet, x-ray, gamma ray
Which types of radiation can be used to disinfect & sanitize bacteria that could potentially harm humans?
ultraviolet
List the visible light spectrum in order from longest wavelength to shortest
Red, orange, yellow, green, blue, indigo, violet
What is the relationship between wavelength and frequency?
If wavelength is shorter, frequency is higher. If wavelength is longer, frequency is lower.
How does energy relate to frequency?
High frequency= high energy
What is the benefit of launching telescopes in space instead of using them in observatories on Earth?
They are above the atmosphere so they can view more types of radiation that may be blocked or distorted if viewed from Earth.
What is the difference between red shift and blue shift?
A red shift shows that a star or galaxy is moving away from Earth. A blue shift would show an object is moving toward Earth.
What type of wave is used for thermal imaging & why?
Infrared is used because it is felt as heat
What is the name of our galaxy & describe its shape?
The Milky Way. It is a spiral or barred spiral galaxy.
What is the only part of the spectrum visible to the human eye?
Visible light
What are electromagnetic waves?
form of energy that travels at the speed of light
