#31 Celestial Motion

In a perfect situation, what shape might a planet's orbit take around a star?

• Circular

• Elliptical

• Square

• Triangular

What is the shape called when an object orbits around 2 central points?

• Ellipse

• Triangle

• Square

• Rectangle

Which planet has the most circular orbit in the solar system?

• Earth

• Mars

• Venus

• Jupiter

What is the term for the two separate points around which an ellipse orbits?

• Centers

• Foci

• Vertices

• Axes

What is escape velocity?

• The speed needed to maintain a circular orbit

• The velocity required to escape the gravitational pull of an object

• The speed at which an object orbits in a perfect circle

• The velocity needed to enter a star's orbit

Which type of orbit does an object have if its velocity is equal to the escape velocity (v = vₑ)?

• Circle

• Ellipse

• Parabola

• Hyperbola

What happens to a planet's orbit if its velocity is greater than the escape velocity (v > vₑ)?

• It forms a circular orbit

• It forms a small elliptical orbit

• It escapes the pull of the star

• It remains stationary

Which planet has the most circular orbit in the solar system?

• Mars

• Earth

• Venus

• Jupiter

How long does it take for Sedna to complete its orbit around the Sun?

• 1 year

• 100 years

• 11,400 years

• 72 years

What causes an orbit?

• Friction

• Gravity

• Magnetism

• Light