1 light year = ________ 9.46 trillion km
A _____ is roughly the amount of time required for the moon to orbit once around the Earth. month
A _____ is the time required for the Earth to orbit once around the sun. year
A _____ is the time required for the Earth to rotate once on its axis. day
a powerful telescope than can detect objects as small as a frisbee, and blackholes. Chandra X-ray observatory
a unit length equal to the distance that light travels in 1 year. light-year
All objects in space give off energy in different ________. wavelengths
An imaginary circle created by extending Earth's equator into space. celestial equator
An imaginary sphere the surrounds the Earth. celestial sphere
An instrument that gathers electromagnetic radiation from objects in space and concentrates it for better observation. Telescope
Ancient cultures used the location and movements of constellations to _____ and ____ ____. navigate and track time
As an object moves away from an observer at a high speed, the light from the object appears redder (Red shift)
As the object moves toward the observer, the light from the object appears bluer (Blue shift) Doppler effect
Astronomers use _____ and _____ to plot positions in they sky. ascension and declination
Atmosphere of Earth reflects _______, making it difficult to get images from the most dim or distant galaxies. light
Believed that the Earth and the other planets, revolved around the sun. Copernicus
Believed that the Sun and the moon revolved around the Earth and the rest of the planets revolved around the sun. Tycho Brahe
Brahe's assisstant Johannes Kepler
Can capture images of dim, and very distant stars, or galaxies. Keck telescopes
collects light and forms an image at the back of the telescope. Bigger the objective lens, more light telescope can gather. objective lens
Confirmed that our universe is much larger than our galaxy Edwin Hubble
Created Ptolemaic theory Ptolemy
Danish astronomer Tycho Brahe
detect radio waves radio telescopes
Detect the other types of radiation being given off by objects in space that cannot be seen. nonoptical telescopes
Did Johannes Kepler agree or disagree with Brahe's theory? disagree
Earth centered universe Geocentric
Every star in the sky is located within ___ of _____ constellations 1/88
First to observe objects in space using a telescope Galileo
Galileo found __ moons circling Jupiter. 4
Galileo found ____ and _____ on the moon. craters and mountains
Greek astronomer Ptolemy
In 1609, after studying the data, announced that all the planets revolved around the sun in elliptical orbits. Johannes Kepler
Large mirrors in a reflecting telescope allow _____ light to gather. more
magnifies the image produced by the objective lens eyepiece
measure of how far east an object is from the vernal equinox the location of the sun the first day of spring. ascension
measures how far north or south an object is from the celestial equator. declination
Optical Telescopes collect _____ _____ and focuses it to focal point for closer observation. visible light
Polish Astronomer Copernicus
Reflecting telescopes that use 36 mirrors to collect and focus more light. Keck Telescopes
Sections of the sky that contain recognizable star patterns. constellations
Showed that all objects in the universe are attracted to one another through a gravitational force. Issac Newton
Stars near the pole arae called _____ because they can be seen at all times a year and all times of night; they never set just circle the celestial poles circumpolar
sun centered universe Helocentric
The angle between an object in the sky and the horizon. altitude
The apparent path of the sun across the sky throughout the year. ecliptic
The force of gravity is dependent upon the...? mass of objects and the distance between them
The line where the sky and the Earth appear to meet. horizon
The movements in the night sky were used by ancient cultures to predict _____ _____, as well as the best planting and harvesting times. season changes
The North Star polaris
The point in the sky directly above an observer on Earth. zenith
the point where rays of light pass through a lens focal point
The Polaris can be found by locating the...? Big Dipper
the study of the night sky and the universe astronomy
The telescope gathers ______ _____ from objects in space and concentrates it for better observation. electromagnetic radiation
Theorized that the universe was Earth centered, and all bodies revolved around the Earth. Ptolemy
To describe a star's location in relation to the Earth, you need a _____. Celestial Sphere
True or False: The people in the Northern Hemisphere see the same constellations as those in the Southern Hemisphere. false
True or False: The stars are further away than the planets. True
Use lenses to capture and concentrate light collected from the sky. refracting telescopes
Used large astronomical tools, to make the most detailed and precise observations made up until that time. Tycho Brahe
Used to study visible light from objects in space. Optical Telescopes
Uses mirror to capture and concentrate light collected from the sky. reflecting telescopes
Using a tool called an ________, you can describe the location of a star or a planet relative to where you are. astrolabe
What are the 4 moons of Jupiter that Galileo discovered? Io, Europa, Ganymede, Callisto
What are the two lens that are used in optical telescopes? Objective lens and eyepiece lens
What are the two types of optical telescopes? refracting and reflecting
Who developed the Helocentric Model of the Solar System? Copernicus
Who was the one who developed the Geocentric Model of the Solar System? Ptolemy