Astronomy Unit 1: Intro to Astronomy and Planetary Motion

How do you calculate the eccentricity of this ellipse?

Low eccentricity is what shape orbit?

The tendency of an object to resist change in its motion is known as

After you start up your dirt bike, as you give it more gas, it goes faster

A girl pulling a sled is crying because when she stopped the sled kept moving into her leg

Which astronomer spent 20 years collecting data and making observations?

Summer Solstice

The more elliptical this ellipse gets… what happens to eccentricity?

In which of the following are action and reaction forces involved?

When a planet is at its perihelion what happens to it velocity?

As an astronaut travels far away from Earth, her weight

In the Ptolemaic model of the universe,

Earth is closest to the sun at a point called

Which scientist determined the nature of the forces that keep the planets in their orbits?

A swimmer pushes water back with her arms, but her body moves forward.

According to the geocentric model...

What is the shape of a planet’s orbit?

Which is the most likely reason that old observers believed in a geocentric universe?

a pattern that makes it appear as though planets are moving backward in the sky

According to the 3rd law of planetary motion, the period of a planet is related to the planet’s

What movement of Earth is responsible for night and day?

Winter Solstice

Seasons are caused by

the force that exists between any two bodies in the universe

Relationship between the aver distance of a planet from the sun and the planet’s orbital period

Vernal Equinox

The force that pulls falling objects toward Earth is called

One astronomical unit (AU) is

Using Tycho Brahe's data, which scientist proposed three laws of planetary motion?

In a diagram depicting the solar system as heliocentric, what is located at the center?

The achievement of lifting a rocket off the ground and into space can be explained by

The first early astronomer to propose a sun-centered solar system was...

Which laws describes the speed of an object travels at different points in its orbits?

the tendency of a body to resist a change in motion unless acted upon by an outside force

Autumnal Equinox

Newton’s third law of motion describes

Which scientist was the first to use the telescope in astronomy?

The law that describes the path of a planet that orbits the sun is called the

Gravity on Mars is about 1/3 the gravity on Earth. The weight of you on the surface of Mars is

The true shape of planetary orbits was discovered by

the time required for a body to complete a single orbit

the degree of elongation of an elliptical orbit

Newton’s 2nd law, says the acceleration of an object=the force acting on the object/by object’s

Who believed that planets moved in epicycles as they revolved in larger circles around Earth?

An orange might roll off your cafeteria tray when you stop suddenly because of

The turning or spinning of a body on its axis is known as

Which of the following helps explain why the planets remain in motion around the sun?

Law that each planet revolves so that an imaginary line sweeps over equal areas in equal time?

The force that gravity exerts on an object changes the objects