Mass

Definition

Mass is a measure of the amount of matter in an object and is typically measured in kilograms. It is a fundamental property that influences gravitational attraction and inertia.

5 Must Know Facts For Your Next Test

1. Mass remains constant regardless of an object's location in the universe.
2. Newton's law of gravitation states that two masses attract each other with a force proportional to their product and inversely proportional to the square of the distance between them.
3. In astronomy, stellar mass determines a star's lifecycle, luminosity, and spectral type.
4. Binary star systems are crucial for measuring stellar masses through their gravitational interactions.
5. Mass is distinct from weight, which varies based on gravitational strength at different locations.

Review Questions

• How does mass influence gravitational attraction between two objects?
• Why is mass considered constant regardless of an object's position in space?
• What role do binary star systems play in measuring stellar masses?

Related terms

Gravity: The force by which a planet or other body draws objects toward its center.

Inertia: The resistance of any physical object to any change in its velocity.

Luminosity: The intrinsic brightness of a celestial object, often dependent on its mass.