THE UNIVERSE Flashcards
Order of the planets
Mercury, Venus, Earth, Mars, Saturn, Jupiter, Uranus, Neptune
What are the two categories of planets
Terrestrial and gas giants
What separates them
The asteroid belt
What is on the outer solar system
The Kuiper belt and the Oort cloud
What are the 5 dwarf planets
Ceres, Make make, Haumea, Eris, Pluto
Name of our galaxy
Milky way Galaxy
Composition of the universe
68% is dark energy, 27% is dark matter and 5% is regular matter
Dark energy theory
Some astronomers theorise that the mysterious force responsible for the expansion of the universe is dark energy
Cause of gravity
The force of gravity on objects near the Earth is caused by the gravitational field of the Earth
Gravitational field
The region of space where an object of mass experiences a force
Centre of Mass
A point that the weight of an object is considered to act
Measuring mass
Use a mass balance
Measuring weight
Use a newton-meter
Examples of natural and artificial satellites
The moon- the ISS, weather satellites or military satellites
Circular motion
When an object moves in a circle at a constant
speed its direction constantly changes. A change in direction causes a change in
velocity because velocity is direction and magnitude. A change in velocity results in
acceleration so an object moving in a circle is accelerating even though its speed may be constant.
