Flashcard Modern Astronomy

Front

What is the relationship between temperature and luminosity of main sequence stars?

Back

As temperature increases, luminosity increases.

Front

What force causes tides on Earth?

Back

Gravitational force from the sun and moon.

Front

What is the latitude of the North Pole?

Back

90° North.

Front

If an observer is at 60 degrees North latitude, what is the altitude of Polaris?

Back

60 degrees.

Front

What are the two points around which an ellipse is drawn?

Back

Foci.

Front

Define luminosity in the context of stars.

Back

Luminosity is the total amount of energy emitted by a star per unit time.

Front

What is the significance of the gravitational force in astronomy?

Back

It governs the motion of celestial bodies and the formation of structures in the universe.

Front

What is the definition of an ellipse in astronomy?

Back

An ellipse is a shape that is defined by two focal points, with the sum of the distances from any point on the ellipse to the two foci being constant.

Front

What is the role of the sun in the formation of tides?

Back

The sun's gravitational pull, along with the moon's, affects the water levels on Earth, creating tides.

Front

What is the difference between aphelion and perihelion?

Back

Aphelion is the point in an orbit farthest from the sun, while perihelion is the point closest to the sun.