1. This scientist played the largest role in attempting to improve the geocentric theory was:
   1. Thales
   2. Aristarchus
   3. Ptolemy
   4. Aristotle
2. This astronomer played a major role in the development of the heliocentric theory:
   1. Eratosthenes
   2. Copernicus
   3. Aristarchus
   4. Hipparchus
3. The scientist Hipparchus was most famous for:
   1. His calculation of the length of the year
   2. His trigonometric chords
   3. His autobiography
   4. His theory on the 3 planetary laws
4. The astronomer who formulated three laws of planetary motion was:
5. Tycho
6. Ptolemy
7. Kepler
8. Copernicus

• The telescope was first used for astronomy by:

1. Kepler
2. Copernicus
3. Newton
4. Galileo

• This English mathematician and scientist formulated the law of universal gravitation:

1. Newton
2. Galileo
3. Cavendish
4. Hugenes

• This English astronomer discovered the mass-luminosity relationship for stars:

1. Kepler
2. Newton
3. Eddington
4. Shapely

• This Germany scientist invented the instrument called the spectroscope that is still in use today:

1. Eddington
2. Bunsen
3. Abbot
4. Wolf

• This scientist created a system known as sunspot numbers for studying solar activity by counting sunspots and sunspot groups:

1. Bunsen
2. Wolf
3. Langley
4. Galileo

• This scientist invented the hypothesis light can be considered to be made up of particles called photons:

1. Bunsen
2. Einstein
3. Newton
4. Kepler

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©Copyright 1998 Elizabeth Beckett, Holly Bernitt, and Vishwa Chandra.