Science Study Guide Space and Gravity

advertisement
Science Study Guide
Space and Gravity
VOCABULARY
gravity – the force of attraction that exists between all objects in the universe
accretion – the process of becoming larger by adding more material
coalesce – to unite; to grow
centrifugal force – the force that tends to push an object outward when it rotates around the center
inertia – a property of matter that keeps an object moving in a straight line and at a constant speed
free fall – the unchecked fall of an object
trajectory – the path of an object moving through space
comet – an icy chunk of rock from a region of space beyond the orbit of Neptune
eclipse – the passing of one object through the shadow of another
satellite – a natural body, like the moon, or an artificial object that orbits another object
space probe – a robot vehicle used to explore deep space
photosphere – the surface of the sun
corona – the sun’s atmosphere
universe – everything that exists – planets, stars, dust, gases, and energy
light-year – the distance light travels in one Earth year
►Gravity pulls us toward Earth’s center. Mass and distance between objects determine the force of gravity.
►High and low tides are cause by the gravitational pull of the sun and moon.
►There are 8 planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
►All planets have 3 things in common:
1.
Orbit the sun
2. Spherical (round)
3. Their gravity controls objects around them
►The Earth revolves around the sun.
►The Earth rotates on its axis.
►The moon has 8 phases. A waxing moon appears to grow larger. A waning moon appears to get smaller.
►Galileo invented the telescope, and used it to observe the moon.
►The sun is a huge ball of very hot gases. It is the center of our solar system.
►Energy from the sun travels in waves: light waves, heat waves, radio waves
►How bright a star looks depends on two things: brightness and distance from Earth
►Blue stars are the hottest stars; red stars are the coolest stars.
►There are 4 types of galaxies: spiral, barred, elliptical, irregular
►Our galaxy is the Milky Way Galaxy; it is a spiral galaxy.
You will be asked to answer one of the following questions (one, detailed paragraph):
Why do we weigh more on Earth than on the moon?
What causes ocean tides?
Why are planets round?
Why don’t planets crash into each other?
Download
Related flashcards
Plasma physics

29 Cards

Astrophysics

65 Cards

Plasma physics

32 Cards

Create flashcards