Physics Flashcards
How do Hinduism believe the universe was created
Universe created by Brahma
How did Atheism belive the universe was created
the universe might simply have existed for all eternity
Ancient beliefs about the universe
Sun eaten by monsters during a solar eclipse
Earth was flat
Earth supported by pillars
Earth Surrounded by oceans
Geocentric model
All the planets and the sun orbited Earth
Earth did not move
An orbservation that could not be explained by geocentric model
Retrograde motion
observations that led to our present model of the Solar System
Galileo’s discoveries about the Moon, Jupiter’s moons, Venus, and suns
supported the idea that the Sun not the Earth was the center of the Universe
describe how observations led to a different model of the Solar System
Because of telescopes more accurate measurements of night sky objects were possible
Describe heliocentric model
the Sun is in the centre of the solar system and all of the planets and other objects in the system orbit the Sun
How do 4 moons orbiting Jupiter prove heliocentric model
if moons could orbit a planet, it’s true that the Earth orbited the Sun after all
Age of Solar system
4.5 billion years
Time scale of the universe
Our galaxy began to form 2 billion years after big bang
Solar system formed 9.2 billion years
Earliest traces of life on Earth emerging 10.3 billion years
why atoms could not be formed immediately after the Big Bang
there isn’t enough energy for these nuclei to fuse together into heavier combinations
what is meant by the Big Bang
the rapid expansion of matter from a state of extremely high density and temperature which created our universe
ways in which the Big Bang theory is supported by evidence
the measured abundances of elements,
the observed expansion of space
the discovery of the cosmic microwave background
name the orbits a satellite can take
low Earth orbit (LEO)
medium Earth orbit (MEO)
High Earth orbit (HEO).
describe how to get a satellite into orbit
putting them on rockets with enough fuel to boost them above most of Earth’s atmosphere
Compare orbits
Low earth orbit - 2000km
Medium Earth orbit - 26,600km
High Earth orbit - 42,200km
state some uses of satellites
Navigation
Communication
Earth observation and imagery
Climate and environmental monitoring
Weather detection
importance of evidence in developing the heliocentric model
dramatically altered the scientific perspective of how we view our world
Benefits of the space programme
Smartphones
Computer-controlled gadgets
Shock-absorbing materials used in sports shoes
Computer programs for swiping credit cards
Water filters
1 soucre of light pollution
Security lights that light up buildings and their surroundings
1 effect that light pollution has on observations of the night sky
increasingly fewer stars are visible in the night sky above us
Risks of space programme
Our Current Technology Makes It Dangerous To Get Into Space
Astronauts Receive Exposure To Natural Dangers While In Space
Explain risks of space station
solar flares and radiation – danger from radiation that could cause cancer
no atmosphere – we need air to breathe | atmospheric pressure to stop our bodies decompressing
