Test 22 Flashcards
___ are loops of solar plasma that rise and fall from the sun’s surface.
Prominences
____ are associated with some craters on the moon which formed by meteor.
Rays
Lunar geologists believe that the only way the moon’s surface changes today is by _____ Impact.
Meteorite
The theory that states that the earth and the moon both originally solidified from the same cloud of dust is the ______ theory.
Accretion
the _____ has a nearly perfect spherical shape because it rotates very slowly.
Moon
The ____ theory of the moon’s formation says that the earth captured a small planet by chance from an orbit around the sun.
Capture
Compared to the earth the average ____ of the moon is less dense.
Density
The moon has long narrow valleys called ______ located mainly in the level plains.
Rilles
Most lunar ____ appear to have formed as a result of meteorite impacts.
Craters
Some ______ may be shrinkage cracks in the moon’s crust.
Rilles
The ______ are called maria because they were believed to have been lakes.
Lunar seas
______ origin theories are a direct reflection of a scientist’s world view.
Moon
_____ are depressions on the surface of the moon usually surrounded by circular walls.
Craters
_____ tides affect the earth’s crust.
Earth
_____ are the dark areas on the moon.
Maria
The points on the moon are called _____ and they always point away from the earth.
Cusps
The ______ is the line that divides the illuminated and shadowed sides of the moon.
Terminator
The _______ has seasons mainly because its axis is tilted.
Earth
The _____ moon visible in the Northern Hemisphere is the full moon that occurs around September 21-23.
Harvest
The apparent path that the sun follows the stars as seen from Earth’s perspective is called _____.
Ecliptic
In what phase of its cycle must the moon be for a total lunar eclipse to take place?
Full
During the first half of the lunar month the moon is said to be _____.
Waxing
The _______ equinox occurs near March 20th.
Spring
What do we call the lunar phase when the eastern half of the moon is lighted?
Last Quarter
We call the 365 named days from January 1 to December 31 the _______.
Calendar year
_______ is the point of the moon’s orbit where it is closer to the earth.
Perigee
________ occurs when the moon is in line with the earth and the sun.
Eclipse
The defined lengths of _____ for the terms day, month, and year vary depending on the perspective from which they are viewed.
Time
___ is a sudden explosion of plasma from the suns surface
solar flair
____ is the part of the sun where thermonuclear reactions are believed to occur
Core
____ is defined as the distance between the earth and the Sun
AU
The sun is composed mostly of _____
Hydrogen
___ are severe storms that can disrupt telecommunications on earth
Solar flares
Protons and neutrons are high speed particles that ____ is mostly composed of
Solar Wind
The suns ____ zone, hot plasma rises to the surface, cools and descends into the suns interior again
Convective
____ are streams of plasma material that rise up into and descend from the suns corona, often forming loops
prominences
____ are the dark areas on the surface of the sun
Sun spots
____ is the classification of a coronal mass ejection
Solar Flares
____ is the lower layers of the suns atmosphere
Chromosphere
____ is the outer region of the suns atmosphere
Corona
____ are the pointed jets on the chromosphere
Spicules
The ___ zone is the region within the sun in which energy travels primarily as electromagnetic waves
Radiative
The process of nuclear ____ releases an enormous amount of energy
Fussion
The ___ is more spherical than the earth
the Moon
The ___ is the visible surface of the sun
Photosphere
The ___ is the instrument that astronomers use to produce an artificial solar eclipse when observing the suns atmosphere
Coronagraph
The movement of ___ indicates that the sun rotates on its axis
Sunspots
The suns surface exists in what state of matter?
Plasma
