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astronomy quarter 1
Terms in this set (49)
What types of electromagnetic radiation emit short wavelength, high frequency waves?
Which form(s) of electromagnetic radiation move at the speed of light?
radio waves, gamma rays, visible light, x-rays
What do the black lines in an absorption spectrum represent?
absorbed wavelengths from present elements in an observed object
Put the terms in the correct order: Using the Doppler Effect, scientists infer that a __________ shows an object moving away from the Earth, while a __________ shows an objects moving towards the Earth
red shift, blue shift
True or False: Our Solar System is at the center of our galaxy
Our galaxy is known as the Milky Way Galaxy. What type of galaxy is it?
Elliptical galaxies are observed to have fewer if any new star activity. Type or record 1-3 sentences to explain why:
I infer that elliptical galaxies have fewer if any new star activities because they don't have the gasses necessary to create/form any new stars. That is was it is filled with mostly old low mass stars.
Which two potential observations support the Big Bang Model:
expanding universe with redshift, cosmic background radiation
Groups of stars in the night sky as seen on Earth are called
What are the three units of measurement used exclusively (only) by astronomers?
parsec, astronomical unit (AU), light-year
The luminosity of a star can be measured in two ways: absolute and relative _________
A star is mainly composed of which two elements?
Hydrogen (H), Helium (He)
If not spending its life as a red dwarf, what are the order of stages of a main-sequence star?
Stellar Nebula, Average Star, Red Giant, Planetary Nebula, White Dwarf
What happens when a super-massive red giant star starts producing Iron (Fe)?
It explodes in a supernova, leading to a neutron star or black hole
True or False: Black holes are objects so dense that not even light can escape their gravitational pull.
Our current understanding of the solar system is as ___, first modeled by Copernicus
Use a calculator: Kepler's Harmonic Law determined an object's distance from the Sun or period of time for it to complete its orbit using the equation below:
P^2 = D^3
√(P^2) = √(D^3)
P = x
If an object is at a distance of 9.54 AU, what is its approximate period?
Many models of the universe and our solar system have been proposed over time. Place the models in their historical order, from oldest to newest:
Geocentric, Heliocentric, Tychonic hybrid
Match the thinker with their associated concept:
Ptolemy - Geocentric
Galileo - telescopes for astronomy
Copernicus - Heliocentric
Newton - Gravitation and Motion
A terrestrial planet is ____ while a gas giant is ___.
A terrestrial planet is a rocky crust w/ dense mantle and core, while a gas giant is divided by 3 layers based on increasing depth and pressure
Which two planets have NO moons?
Venus and Mercury
True or False: Earth is the only planet that we know of that has life.
Mars has slowly lost its atmosphere over time in part due to its weakened ___.
The four largest moons of Jupiter are known as the Galilean moons because
they were discovered by Galileo
Which gas giant planets have ring systems of debris in orbit around them?
Order the planets from closest (top) to farthest (bottom) from the Sun
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
true or False: The icy gas giants of Uranus and Neptune have no moons
The _ is a field of debris between Mars and Jupiter, while the _ is a field of debris beyond Neptune
asteroid belt, kuiper belt
Comets are organized into two types as short-period and long-period comets. What does that mean?
Shorter or longer orbits of 200 years
What are the differences between a planet and a dwarf planet? Type or record 1-3 sentences as your response:
Dwarf planets are not classified as planets because they cannot clear the neighborhood around its orbit.
Match the definitions for meteoroid, meteor, and meteorite:
meteoroid - object of rocky/metallic substance smaller than an asteroid but larger than dust in space
meteor - space debris that is entering against an atmosphere, causing light and heat
meteorite - space debris that has struck the surface
Match the definitions to their type of eclipse
Solar - When the moon covers or partially covers the Earth's surface with its umbra
Lunar - When the moon is covered or partially covered by the Earth's umbra
What are the two main geographic regions on Earth's moon?
True or False: the normally visible layer of our Sun is the Corona.
What would be the phases of the Moon from the Full Moon to the New Moon? Place in the correct order:
Using kilometers (km) is better used to measure which distance?
Distance between cities
Which of the following are NOT units of metric measurement?
Feet, Teaspoons, Yards
True or False: The metric system depends on the power of 10. For example, 120 milligrams is equal to 12 centigrams
Match the metric unit with what it measures
Celsius - temperature
gram - mass
liter - volume
meter - length
pascal - pressure
Which early scientist used math to determine planetary motion as elliptical orbits?
Laws on gravitation were first written by:
Our current understanding of the solar system is as ___, first modeled by Copernicus.
Kepler's Harmonic Law determined an object's distance from the Sun or period of time for it to complete its orbit using the equation below:
P^2 = D^3
If an object is at a distance of 1.5 AU, what is its period?
Epicycles were first used as a way to explain retrograde motion in which model of the Solar System?
Venus would be deadly for people to live on for many reasons, including its:
Sulfuric acid weather
Mars is titled at a similar axis compared to Earth, allowing for what?
Mercury lacks an atmosphere for which three reasons?
smaller mass, weak magnetic field, strong solar winds
What feature is unique about Uranus compared to the other planets?
Its axis is highly tilted
Which requirement to be a planet is it that dwarf planets fail to meet?
able to clear its orbit of large debris
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