(Science) Physics Flashcards
What is the ancient Greek belief about the creation of the Universe?
The ancient Greeks believed that the universe was made up of four elements: earth, air, fire, and water. They also believed in the concept of the celestial spheres, which were a series of spheres that rotated around the earth.
What is the Ancient Egyptian belief about the creation of the Universe?
The ancient Egyptians believed in the concept of Ma’at, which was the balance and harmony of the universe. They also believed in the afterlife and the importance of preserving the body for the next world.
What is the belief of the Geocentric model of our solar system?
This is the belief that the earth is the CENTRE of our universe
what is an observation that could not be explained by the geocentric model?
The geocentric model couldn’t yet explain why planets would appear brighter and darker at different times.
what is a observation that led to our present model of the Solar System?
It was Galileo’s observations (made around 1609) of Jupiter and the orbit of its moons that were of enormous significance in leading to the downfall of the geocentric worldview developed by the Greeks.
what is a observation that led to a different model of the Solar System.
Copernicus introduced a new model which was consistent with the observations and allowed for perfect circular motion. This is known as the Heliocentric model where the Sun is placed at the centre of the universe (hence, the Solar System) and the Earth is, like all the other planets, orbiting it
What is the difference between the Heliocentric model and the Geocentric model?
The Heliocentric model is the belief that the sun is in the middle of the solar system and the planet orbit around it.
The Geocentric model if the belief that the Earth is in the middle of the solar system and the planets orbit around it.
How old is our solar system?
4.5 billion years old
Why could atoms not be formed after the big bang?
The universe was so hot and dense that the electrons and photons couldn’t clump together to make atoms
What is the name of the theory of how the universe started?
The Big Bang
What is meant by the big bang?
That a giant explosion happened, then stretched and grew. It is thought to still be growing now
What is evidence to back up the big bang?
The measured abundances of elements, the observed expansion of space, and the discovery of the cosmic microwave background.
What is the cosmic microwave background?
The oldest and most distant light that we can see in the entire universe
What are the orbits a satellite can take?
Low Earth orbit (LEO), medium Earth orbit (MEO), and geosynchronous orbit (GEO
How do you get a satellite into orbit?
The satellite is placed on top of a huge rocket to carry it away from the Earth and up through the atmosphere.
