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Cards
test
16
Astronomy
Undergraduate 1
01/29/2017

Additional Astronomy Flashcards

 


 

Cards

Term
Our Galaxy
Definition
Milky Way
Term
How many moons are in our solar system?
Definition
165
Term
How long does it take light to to reach the earth from the sun?
Definition
8 1/2 minutes
Term
What's the speed of light?
Definition

186,000 miles/sec.

Term
how far is the moon
Definition
239,000 miles from the earth
Term
how long is our galaxy
Definition
100,000 light years across
Term
how many miles is 1 light year equal to
Definition
6 trillion miles
Term
how big is the known universe
Definition
12 billion light years across
Term
what is Perihelion and aphelion
Definition

p: point where the earth is closest to sun Jan 3

a: point where earth is furthest from sun Jul 3

Term
define elliptical
Definition
Elongated path earth takes around the sun
Term
define thermopause
Definition
outermost portion of earths atmosphere-it helps to disperse/aborb solar energy
Term
define insolation
Definition
solar radiation that reaches the horizontal plane
Term
solar constant
Definition
the average insolation recieved at the thermopause when Earth is at its average ditance from the sun (93 million miles)
Term
subsolar point
Definition

point receiving insolation perpendicular to the surface

(usually found between tropic of cancer and tropic of capricorn)

Term
how long does it take the earth to travel around the sun
Definition
365 days 5 hours 49 minutes
Term

March 21 in the north

a. spring equinox

b. fall equinox

c. summer equinox

d. winter equinox

Definition
A. Spring Exquino
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