Doubts, Tests and Acceptance: teacher key

Albert Einstein, grade 11 edition, written for 11th grade. Doubts about the 1919 eclipse and some of Einstein's own, the tests of light and clocks that followed, and how his theory came to be accepted.

Read the book. Print this page for the key.

Questions and answers

1. What did some astronomers question?
   • The size of Ulm
   • The 1919 eclipse results (answer)
   • The compass needle
2. Until when could astronomers not demonstrate the bending of light beyond reasonable doubt?
   • The 1860s
   • The 1990s
   • The 1960s (answer)
3. What kind of universe did Einstein at first hold to?
   • An expanding universe
   • A shrinking universe
   • A fixed, static universe (answer)
4. What did Hubble discover?
   • That clocks run on air
   • That galaxies are moving away from one another (answer)
   • That the Sun is a planet
5. What does Einstein's theory say about the expanding galaxies?
   • The galaxies are stopping
   • The fabric of space itself is expanding (answer)
   • The galaxies are light