Perspective Flashcards
what is our cosmic address
planet earth, solar system inc moons asteroids and icy comets. Milky Way galaxy, local group,local super cluster, universe
word meaning earth centered
Geocentric
what is meaning of universe
all matter and energy and voids
what is an AU
astronomical unit is earth’s average distance from the sun, 150 million kilometers=93 million miles. for use in our solar system
what is ly
a light year. distance light can travel in one year
;10 trillion kilometers or 6 trillion miles. for distances of stars and galaxies
Estimate of the age of the universe
14 Billion years old.
The distance of 14 Billion light years marks what
The Boundary or Horizon of our Observable universe
What is the observable universe
The portion of the entire univers that we can potentially observe. No limit on the size of the universe.
MVeMJSUN
My very energetic Mother just served us nuts
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
what is the classification of Pluto and Eris since when
Dwarf planets. 2006 pluto was demoted. 2005 Eris discovered.
What do you use when working with powers of ten
Scientific notation
Our solar system is a ____ star system
Single
——- and —— ——- show regions where ——– won over expansion
Galaxy and Galaxy Clusters gravity.
surrounds the Earth with Constellations that have definite borders
Celestial sphere. We see only half of the dome on our LOCAL SKY
What is the Horizon
Boundary between earth and sky
What is the Zenith
Point directly overhead
What is Meridian?
Runs due north and due south through Zenith
What makes stars appear to circle around the earth?
Earth Rotation
If a stars complete circle is above the horizon it is said to be
Circumpolar
The constellations vary with ?
Latitude. Because your LATITUDE determines the orientation of your horizon relative to the celestial sphere.
What causes the seasons?
The tilt of Earths AXIS. Points in same direction always so as we go around the sun different parts receive more sun at different times.
What is precession?
The 26,000. Yr cycle of our axis. Remains at 23.5 degree. Does Not affect seasons.
Does change identity of North Star and shifts the location of solstices and equinoxes
The ? Of the moon depends on its ? Relative to the sun as it orbits earth
Phase. Position. The side facing the sun is always illuminated , but from Earth we see varying combos of the illuminations and dark faces.
Solar eclipse
Moon blocks our sun
Lunar eclipse
Earth shadow on the moon. We in middle
Because the moons orbit is slightly ? to the ecliptic plane , we ? See an eclipse at every full and new moon
Inclined . Do Not see.
Planets generally move ? Relative to the stars
East
When Earth passes or is passed by other planets
Apparent retrograde motion. They seem to go backward. Ancients did not understand this because they thought earth was center.
Greeks rejected the idea that earth goes around sun because they could not detect ?
Stellar Parallax
Slight apparent shifts in stellar positions over a year
Stellar Parallax. The Greeks did not know that the stars were so far away.
A gas consisting of electrons and ions
Plasma
Atom with positive or negative charge
Ion
Your altitude =
Your latitude
Who patented the telescope
Hans Lippershey in1608. Galileo perfected it. made it into a tool
What are the 3 objections of Aristole’s views from Galileo
- earth could not be moving, birds would fall behind. How:
Objects in motion stay in motion until a force stops them. - Heavens must be perfect
Tyco showed supernova and comets, things change. G with telescope saw sun spots, shadows of craters on moon (not smooth) - Absence of stellar parallax
showed Milky Way and thousands of far away stars
Nails in earth centered theory
G with telescope found four moons orbiting Jupiter. The current belief was our moon could not stay with a moving Earth
Venus went thru phases.
Whose Laws predicted Mercury transit across the Sun
Kepler German
