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1

Number of galaxies in the universe

125

2

Our galaxy

Milky way

3

Location of our solar system

on the trailing edge of the milky way

4

Light years in diameter?

100,000

5

We are ______ light years from the center

30,000

6

Milky Way

flattened disk shaped collection of stars, barrel shaped

7

Whats at the very center of the milky way galaxy?

a black hole

8

Formation of the solar system

1. large rotating cloud of gas and dust
2. nebula cloud flattened into a disk shape
3. gravity pulled matter proportional to its mass together, forming a protosun
4. the proto sun grew in mass, drawing more mass to it
5. meanwhile, material accreted together creating protoplanets, which in turn drew more mass towards them to create planets

9

Gravity

mutual force exerted by the mass of objects that are attracted one another and produced in an amount proportional to each object’s mass

10

Planetesmal hypothesis

suggests a process by which early protoplanets formed from the condensing masses of a nebular cloud of dust, gas and icy comets

11

Moons in our solar system

165 (around 6 planets)

12

Planets in our solar system

8

13

Speed of light

300,000 km per second

14

How long does it take for light to travel the diameter of our solar system?

11 hours

15

Earth orbits around the sun in a _______ (_____) path

elliptical (oval) path

16

Perihelion

when the Sun and Earth are closest in distance (January 3)

17

Aphelion

when Sun and Earth are farthest apart (July 4 )

18

Plane of the Ecliptic

a plane touching all points of Earth’s orbit

19

Cause of sun spots

Visible surface disturbances on the sun caused by magnetic storms

20

What causes the auroras?

When solar wind reacts with the magnetosphere and is directed above the poles, where they interact with gases in the ionosphere

21

Magnetosphere

Earth’s magnetic force field, which is generated by dynamo-like motions within the planet’s outer core; deflects the solar wind flow toward the upper atmosphere above each pole

22

Aurora

Coronal mass ejections ( and solar flares and solar winds) interact with the magnetosphere and gases in the ionosphere to create a light display at the poles

23

Frequency (

number of waves passing a fixed point per second

24

Wein's Displacement Law

all objects radiate energy in wavelengths related to their individual surface temperatures (the hotter the object, the more shortwave radiation emitted)

25

Wavelength

The distance between two corresponding point on any two successive waves

26

Stefan Boltzman Law

Objects that are efficient absorbers or radiation are good emitters too

27

Solar minimum

period during which FEW sunspots are visible

28

Solar maximum

period during which sunspots are numerous.

29

Sun spot cycle

11 years between solar maximums, where magnetic activity (solar flares, CME's, magnetic storms, prominence flares)

- most of the flares are pulled back into the sun because of magnetic force, some are released in the form of solar wind

30

Solar Wind

Clouds of electrically charged particles?