the point over Earth's north pole. -near Polaris or the North Star
what constellation are Alcor & Mizar in...
the abillity to seperate 2 points of light as 2 points
light is collected and focused by a lens (bending the light due to slowing down)
wider field of view
objective is a mirror
collects and focuses light
the 40inch diameter objective telescope is located....
Yerkes Observatory -Williams Bay, WI
the biggest reflector telescope (Cassegraine) is located....
the most famous telescope is the...
Hubble Space Telescope
the Geocentric Model is...
the assumption that the Earth was stationary at center
sun "rise" to sun "rise" 24 HOURS
star "rise" to star "rise" 23 HOURS 56 MINUTES
moon phase to moon phase
constellation in exact place at exact time 20 mins LONGER than solar year
sun in exact place at exact time
are stars stationary
planets moving in the direction opposite to the movement of something else
Aristotle deduced that...
the earth is round
Aristotle believed in the ______ model
Aristotle thought that the planets were perfect _____
Aristarchus of Samos said that Earth is...
NOT at center -believed in the Heliocentric Model
What did Hipparchus do?
*developed a system for ranking stars by brightness (magnitude) -smaller the number, brighter the star. *discovered the 26,000 year cycle of stationary point. *created 1st star catalog
Copernicus deduced the...
*correct order of the planets. *the time it took each planet to orbit the sun.
Galileo Galélei discovered the Earth is not at the center because he discovered that...
*the Milky Way is composed of stars *moons around Jupiter
Galileo Galélei discovered that planets were not perfect spheres because he discovered...
*mountains on the moon *Saturn shows "bulges" *sunspots
describe Tycho Brahe and his accomplishments.
*used no telescope- VERY accurate *recorded positions of the sun, moon, and planets for 20 years. *astronomer with the golden nose. *hired Johannes Kepler as his assistant.
Johannes Kepler discovered the...
Three Laws of Planetary Motion
what are the Three Laws of Planetary Motion
1. Planets move in elliptical orbits - with sun at one focus. 2. Law of Equal Areas. - planet sweeps out of equal areas in equal times 3. (time to revolve around the sun in YEARS)2 = (average distance from the sun in ALL)3
Isaac Newton discovered the...
Universal Law of Gravitation. - motion needs force. - gravity is a non contact force.
what is the Universal Law of Gravitation?
F↑ as Mass↑ = direct relationship F↓ as Dist. ↑ = inverse relationship (not gravity) F↓ as Dist.2↑ = inverse squared relationship
what are the 4 characteristics of a wave?
1. Wavelength 2. Amplitude 3. Frequency 4. Speed (distance/time)
light travels through a...
WAVELENGTH is the...
distance between identical points λ LAMBDA
WAVELENGTH determines the _____ of a wave.
AMPLITUDE is the....
height of a wave. the symbol for it is A
AMPLITUDE determines the ______ of a wave.
FREQUENCY is the...
number of waves passing through a point in a given time. the symbol for it is μ
FREQUENCY determines the _____ in a wave.
WAVELENGTH is measured in...
what is TRANSMISSION
light passing through a material a window. (slows down going through window, then speeds back up)
bending of light due to edges.
separation of wavelengths from a mixture. (going through a prism at different speeds, prism effect)
redirection of light by particles (light goes everywhere, MANY beams of light)
SPEED OF LIGHT is....
the speed at which light travels
every element has a unique spacing of energy levels.
basically.... astronomers use it to find out the temperature of a star.
Want to see the other 52 Flashcards in ASTRONOMY- Weeks 1-3 (final review- methods of viewing, ancient astronomers, light waves)?JOIN TODAY FOR FREE!