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a solar system contains....
a single star and planets
a galaxy contains...
large amounts of gas, dust, and stars
which of the following is the largest?
the distance from Earth to the Sun
Which arrangement is in order of increasing sizes, left to right?
planet, star, solar system, galaxy
Circle whose center is lcoated on the circumference of another circle
Ptolemy's model of the universe contained...
Tycho Brahe's greatest contribution to astronomy was...
his years of careful observations of the planets
A____ is a single conjecture that can be tested
Halley's comet has an orbital period of 76 years. What is the average distance of Halley's comet form the sun?
Earth is considered a planet for all but which reason?
it has a large natural moon
Pluto is considered a dwarf planet for all but which reason?
it lies too far from the Sun to be a planet
Average distance from Earth to the Sun is one...
AU (astronomical units)
Newtons three laws of motion
1. law of inertia
2. F= ma
(isaac newtons 3 laws) Law of inertia
every object in a state of rest or uniform motion remains in that state unless an external force is applied to it.
(isaac newtons 3 laws) F=Ma
the rate of change of momentum of an object is directly proportional to the resultant force acting on it
force= mass and acceleration
(newtons 3 laws) Action/ reaction
For every action, there is an equal and opposite reaction
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