1Everything orbits around the earth. What is this theory called?
geocentric
2Everything orbits around the sun. What is this theory called.
heliocentric
3Why is gravity greater on the earth than on the moon? Answer with number.
1. Because of the size difference
2. Because moon is closer to the sun
3. Because Earth contain more substances that cause gravity
1
4What is the very beginning of the universe called?
The moment of singularity
5What happened a few seconds after the moment of singularity
protons and neutrons
6When did the Big Bang happen?
13.7 billion years ago
7What kind of elements started to form shortly after the moment of singularity? Answer with number.
1. complex
2. small
3. simple
3
8What era did lights start to form?
radiation era
9When did radiation era begin in the Big Bang? Answer in the form shown: "-----years later"
300,000 years later
10When did first stars start to form? Answer in the form shown: "----- years later". Also, what is this era called? Separate answers with ("/ "). Add space after slash.
100 million years later/ matter domination era
11Who proved that the space was increasing its size?
Edwin Hubble
12Non-contact force of attraction between objects
Gravity
13
what evidence suggests that Big Bang actually happened?
galaxies are slowly moving away
14what is cosmology?
study of the nature of universe
15who was the first person to propose the geocentric model of the solar system?
plato and aristotle
16who was the first person to discover the heliocentric model?
aristarchus
17famous prussian mathematician who agreed with the heliocentric model
copernicus
18who proved that planets' orbits were elliptical
Kepler
19How did Galileo prove the heliocentric model? and when?
he saw objects in orbit around jupiter in 1609 AD
20Newton
discovered gravity
21who made the big pendulum
Foucault