The Birth of Modern Astronomy

Front

Who created the 'standard candle' used to measure distances to faraway galaxies?

Back

Henrietta Swan Leavitt

Front

What law states that objects with mass exert an attractive gravitational force on all other objects with mass?

Back

Newton's Law of Universal Gravitation

Front

Who discovered the first pulsar in 1967?

Back

Jocelyn Bell Burnell

Front

What does Newton's First Law of Motion state?

Back

An object in a state of rest or motion will remain so unless acted upon by an outside force.

Front

Which Law of Planetary Motion states that a planet moves fastest in its orbit when it is closest to its star?

Back

Second Law of Planetary Motion

Front

What is the significance of Henrietta Swan Leavitt's work in astronomy?

Back

She developed the concept of 'standard candles' for measuring astronomical distances.

Front

What is Newton's Law of Universal Gravitation?

Back

It states that every point mass attracts every other point mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Front

What is a pulsar?

Back

A pulsar is a highly magnetized rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles.

Front

What does Newton's Second Law of Motion describe?

Back

It describes the relationship between the force applied to an object, its mass, and its acceleration (F=ma).

Front

What is the First Law of Planetary Motion?

Back

It states that planets move in elliptical orbits with the sun at one focus.