Scientific Theories
Scientists use the ___________ to describe their observations on how galaxies are expanding.
Answer: What is the Big Bang Theory?
What is the Big Bang Theory?
Answer: The Big Bang Theory is a model explaining exactly how the universe began.
In what state did the universe emerge from?
Answer: It emerged form a state of density and pressure (Big Bang)
What is visible light?
Answer: A form of elecrtromagnetic energy that travels as a wave
How does the Balloon analogy explain expansion of the universe?
Answer: Closely spread dots on surface spread slowly, while dots far apart spread quickly
Scientists believe that _______ are moving farther apart.
Answer: What is galaxies?
The event that occurred when the universe emerged from this state is known as the ______ .
Answer: Big Bang
When did two scientists accidentally discover an unexpected radiation coming from all directions in space?
Answer: 1965
Does each galaxy emit their own spectrum/range of colours in a pattern? Yes or No?
Answer: Yes
What is the "slight glowing" like from the Big Bang?
Answer: It is like when you put out firewood an it still glows
Scientists estimate the universe to be about ____ billion years old.
Answer: What is 13.8 billion?
All ______ of the universe, was packed together into one small, extremely dense, hot mass under pressure.
Answer: Matter
What caused the CMBR (Cosmic Microwave Background Radiation)?
Answer: 300,000 years after Big Bang when the electrons fused with protons to create hydrogen.
How can we tell a star is moving?
Answer: We can tell an object is moving by red shift
In the Duck analogy when duck is not moving, are the waves constant or not?
Answer: Yes, they are constant
Scientists believe the universe exploded from an incredibly hot, dense _______________.
Answer: What is a singularity? (or point the size of a single atom)
Even after the Big Bang occurred, we now know EVERYTHING about the universe. True or False?
Answer: False - Scientists CAN describe what they think occured about a fraction of a sec. after the Big Bang, but not everything was revealed after the explosion.
When did the astronauts find evidence of galaxies moving?
Answer: 1912
What RED SHIFT?
Answer: Red shift refers to the shift in a wavelength of light to longer wavelengths of light
When the duck is moving, what happens to the wavelengths?
Answer: The wavelengths become shorter in one direction and longer in the other direction
Astronomy is the study of __________________.
Answer: What is the study of the moon, stars, and other objects in space?
The Big Bang Theory is currently the best way that the beginning of the universe can be explained. True or False?
Answer: True - There are other ideas of how the universe began but the Big Bang is best supported by scientific evidence.
What have the galaxies been doing since the big bang?
Answer: The galaxies have been expanding/spreading
Do ALL galaxies show red shift? Yes or No?
Answer:Yes
What is the Duck analogy similar to?
Answer: It is similar to the galaxies expanding and spreading apart.