Standard 1 Objective 2Study Notes

Astronomy 2

1

• _____ is the most likely destination for manned _________ and surface exploration because it has some conditions ______ to Earth.

Mars voyages

similar

2

• Liquid water and oxygen/carbon dioxide in the atmosphere are conditions on _______ that support the ____________.

Earthbiosphere

3

• The _______ solar system object is the _____.Sunlargest

4

• The ______ ______ and heat from the newly formed sun affected the composition of the inner planets of the solar system by causing them to lose most of their ______ ________.

solar wind

lighter elements

5

• A rock sample containing Strontium 30 is tested and ___% of the original Strontium remains. The Strontium 30 has undergone two _________.

25

half-life’s

6

• The ____ of the solar system is estimated by scientists by dating __________ elements.

ageradioactive

7

• A spherical region that surrounds the solar system and that contains billions of ______ is the ______ cloud.

cometsOort

8

• A _______ is made up of______ , dust and gas bound together by gravity.

galaxy stars

9

• A rotating cloud of ____ and _____ from which Earth’s solar system formed is called the _______ _______.

gas dust

solar nebula

10

• The two inner planets most ______ in size, mass, and ________ are Venus and _______.

alikedensity Earth

11

• The _____ dense planet in the solar system is ________.

leastSaturn

12

• The factors that contribute to _________ daily temperature fluctuation of about 600°C are the planet’s slow rotation and its ______ proximity to the sun.

Mercury’s

close

13

• _______ volcanoes are larger than those of Earth because Mars has no moving ________ plates.

Mars’stectonic

14

• Small bodies that _____ planets are called ______.

orbitmoons

15

• About ___% of all matter contained in the solar nebula now exists in the _____.

99sun

16

• When early Earth’s atmosphere formed, _______ and _________ gases were lost because Earth’s gravity was too _____.helium

weakhydrogen

17

• ______ is NOT considered a major planet by astronomers.Pluto

18

• _______ is a planet that experiences a runaway ___________ effect.

Venusgreenhouse

19

• The right combination of ___________, water, and _______ supports _____ on Earth.

temperatureoxygen life

20

• _________ is a planet that is similar to ______ in terms of its size and mass.Neptune Uranus

21

• The _____ atmosphere developed when many ________ eruptions released large amounts of gases in a process called outgassing.

earlyvolcanic

22

• The ________ belt can be found between the two planets Mars and Jupiter.

asteroid

23

• A ____-_____ the distance light travels in a year.

light year

24

• From _________ to the largest in size would be the Solar System, Milky Way Galaxy, and the ________.

smallest

Universe

25

• ___________ substances are used by scientists to measure the ____ of Earth because they give off radiation at a predictable, steady ____.

Radioactiveage

rate

26

• The _____ abundant atmospheric gases found on the outer planets are _________ and _______.

mosthydrogen

helium

27

• The solar system is much _______ than the ______ _____ galaxy.

smallerMilky Way

28

• _____ is most like Earth because it has an __________ and moderate ____________.Mars

temperaturesatmosphere

29

• The Earth’s atmosphere and the _______ Earth is from the sun combine to create an _______ rich atmosphere.

distance

oxygen

The End!!!