What Is a Rotation Curve

question 87

Multiple Choice

What is a rotation curve?

• A)a precise description of the shape of a star's orbit around the center of the Milky Way Galaxy
• B)a graph showing how orbital velocity depends on distance from the center for a spiral galaxy
• C)a curve used to decide whether a star's orbit places it in the disk or the halo of a spiral galaxy
• D)a graph that shows a galaxy's mass on the vertical axis and size on the horizontal axis

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Definitions:

GEO

Geostationary Earth Orbit; a circular orbit around Earth that allows satellites to remain in the same position relative to the Earth's surface.

LEO

Stands for Low Earth Orbit, which is an orbit around Earth at an altitude between 160 kilometers (99 miles) and 2,000 kilometers (1,200 miles).

MEO

Medium Earth Orbit, a region of space around Earth with altitudes between 2,000 and 35,786 kilometers, used for satellite communication and navigation systems.

Satellite Telephone Services

Communication services that use satellites to provide telephone connectivity to users in remote or underserved areas.