The Universe Study Guide for Science Class.
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| What statement best descibes the relationship between wavelength & frequency? | As wavelength increases, frequency decreases.
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| 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.
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| What is the predictable life cycle for a low mass main sequence star? | Red Giant -> White Dwarf -> Black Dwarf
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| As the amplitude of the wave decreases, what would happen to the wave height? | It also decreases.
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| Which of the following waves needs a medium to travel through? | Mechanical
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| Describe the difference between a sound wave & a light wave. | Sound waves need a medium & light waves do not.
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| Electromagnetic waves move A) Matter B) Energy C) Both | B) Energy
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| Radio waves have the _______ wavelengths on the EM spectrum. | Longest
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| Radio waves carry ______ for television, radios, & cell phones. | Energy
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| _________ _________ have been seen all over the universe providing evidence for the Big Bang Model of the Universe. | Microwave Radiation
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| Visible light is the only _______________ wave we can see. | Electromagnetic
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| The color of the object we see is the __________ of light _________. | Wavelength; Reflected
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| 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.
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| What are three types of galaxies? | Elliptical - Oldest Spiral - Middle Irregular - Youngest
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| What type of galaxy is the youngest? How do we know? | Irregular, has the most gas & dust.
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| What type of galaxy is the oldest? How do we know? | Elliptical, has the least gas & dust.
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| What galaxy do we live in? | Milky Way
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| How fast does light travel? | 186,000 miles/second or 300,000 kilometers/second
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| 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
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| Explain the following phrase, "Sunlight is eight minutes old." | It takes eight minutes for the sunlight to reach the Earth.
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| 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.
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| Where are stars formed? What creates all of the gas & dust? | Nebula; Supernova
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| What force is responsible for the creation of stars? | Gravity
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| All main sequence stars fuse what type of gas? | Hydrogen
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| What type of star is our Sun? | The Sun is a main sequence star & has low mass.
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| 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
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| When the main sequence star becomes a red giant or red super giant, what element is it fusing? | Helium
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| Why don't all stars end their life in the same way? | It depends on the star's mass.
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| Black holes are super-dense places in space that even what cannot escape? | Light
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| What will happen to the Sun in the future? | Main Sequence -> Red Giant -> White Dwarf -> Black Dwarf
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| What is the difference between a white dwarf & a red giant? | White Dwarf (No Fusion) Red Giant (Fusing Helium)
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| What happens to the dust & gas following a supernova? | Creates a nebula.
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| If a high mass star undergoes a supernova is it more likely to become a black hole or a neutron star? | Neutron Star
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| In what way is the life cycle of stars a cycle? | High Mass Star: Nebula -> Main Sequence -> Red Giant -> Super Nova
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