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The Universe

The Universe Study Guide for Science Class.

What statement best descibes the relationship between wavelength & frequency? As wavelength increases, frequency decreases.
An astronomer observes the light that an object in space is emitting. He notices that the spectrum is shifted to the red. What can the astronomer conclude about the movement of the object? It is moving away from the Earth.
What is the predictable life cycle for a low mass main sequence star? Red Giant -> White Dwarf -> Black Dwarf
As the amplitude of the wave decreases, what would happen to the wave height? It also decreases.
Which of the following waves needs a medium to travel through? Mechanical
Describe the difference between a sound wave & a light wave. Sound waves need a medium & light waves do not.
Electromagnetic waves move A) Matter B) Energy C) Both B) Energy
Radio waves have the _______ wavelengths on the EM spectrum. Longest
Radio waves carry ______ for television, radios, & cell phones. Energy
_________ _________ have been seen all over the universe providing evidence for the Big Bang Model of the Universe. Microwave Radiation
Visible light is the only _______________ wave we can see. Electromagnetic
The color of the object we see is the __________ of light _________. Wavelength; Reflected
Using what you know about Red & Blue shifts, suppose you could see the light coming off a moving object & this object was approaching you, what color would you see & why? Descibe the wave in terms of wavelength & frequency coming from this object. A Blue Shift has a short wavelength & a high frequency.
What are three types of galaxies? Elliptical - Oldest Spiral - Middle Irregular - Youngest
What type of galaxy is the youngest? How do we know? Irregular, has the most gas & dust.
What type of galaxy is the oldest? How do we know? Elliptical, has the least gas & dust.
What galaxy do we live in? Milky Way
How fast does light travel? 186,000 miles/second or 300,000 kilometers/second
A star is 4.3 light years away from Earth. How long does it take for light to travel from that star to Earth? 4.3 years
Explain the following phrase, "Sunlight is eight minutes old." It takes eight minutes for the sunlight to reach the Earth.
Is it possible that some of the stars in the night's sky no longer exist? Explain your answer. Yes, because they're so far away that light is still traveling to Earth.
Where are stars formed? What creates all of the gas & dust? Nebula; Supernova
What force is responsible for the creation of stars? Gravity
All main sequence stars fuse what type of gas? Hydrogen
What type of star is our Sun? The Sun is a main sequence star & has low mass.
A star is 4.3 light years away from Earth. How long does it take for light to travel from that star to Earth? 4.3 years
When the main sequence star becomes a red giant or red super giant, what element is it fusing? Helium
Why don't all stars end their life in the same way? It depends on the star's mass.
Black holes are super-dense places in space that even what cannot escape? Light
What will happen to the Sun in the future? Main Sequence -> Red Giant -> White Dwarf -> Black Dwarf
What is the difference between a white dwarf & a red giant? White Dwarf (No Fusion) Red Giant (Fusing Helium)
What happens to the dust & gas following a supernova? Creates a nebula.
If a high mass star undergoes a supernova is it more likely to become a black hole or a neutron star? Neutron Star
In what way is the life cycle of stars a cycle? High Mass Star: Nebula -> Main Sequence -> Red Giant -> Super Nova
Created by: RamirezA5691