Astronomy A: Unit 1 - Lesson 7-8

_____ refined Isaac Newton's ideas, namely in relativity.

Albert Einstein

_____ force draws objects away from a center.

Centrifugal

_____ force draws toward a center.

Centripetal

_____ operates in all parts of our solar system and beyond.

Scientific Law

We have more accurate knowledge of astronomy today because we have applied insight from the past.

True

A point critical to understanding and applying the law of universal gravitation is that the force of _____ between any two objects is _____ to the _____ of their masses.

attraction, proportional, product

Gravitation is universal because it extends from Earth to the Moon to produce _____, which keeps the Moon in orbit about our planet and our planet in orbit about the Sun.

centripetal acceleration

The attractive force of two objects for each other was named _____ by Isaac Newton.

gravitation

Another critical point is that the force of attraction is _____ proportional to the _____ of the distance between any two objects.

inversely, square

Gravitation is _____ to the mass of any particular object.

proportional

A(n) _____ telescope uses mirrors to send light through an eyepiece to enlarge distant objects.

reflecting

Isaac Newton invented and built the first _____ in 1668.

reflecting telescope