Gravity is.....
The force that pulls objects to one another.
The force of power.
The fore that exerts pressure.
Check all the steps to the life of a star the size of a sun in order.
They start in a nebula a giant cloud of dust and gas.
The gases and dust begin to clump and heat up until they begin to perform nuclear fusion. (Called a protostar)
When the nuclear fusion has started, the star is known as a main sequence star and if its the size of the sun or less, it can live anywhere from 10 billion to trillions of years.
After the star has used up all the hydrogen and other fuels, it begins to swell into a red giant. If larger than the sun, they will become a red supergiant.
Outer layers of the star drift away, then the core shrinks to become a a small, hot, dense white dwarf stars.
White dwarf eventually cools and fades.
Describe in order, the formation of the solar system.
At first, the gas that was in the atmosphere was blown away by the solar winds. Then they began to clump and collide to form the Gas Giants.
Then, the heavy materials which are still close to the sun began to clump and collide to form the Terrestrial Planets.
The rest of the matter became asteroids, comets, and moons.
The Terrestrial Planets are made out of the heavier materials in our solar system, and can be called the Inner Planets.
The Gas Giants are not made of gas. They cannot be called the Outer Planets.
Why are some planets made out of gas, and others of solid material?
The Gas Giants were made because of the solar winds blowing all the gas outwards.
The solid material stayed near the sun to create the Terrestrial Planets.
What is the main evidence that leads to us assuming the universe expanding?
The Red Shift
The Blue Spread
The Yellow Space
Violet has the _______ wavelength.
Longest
Shortest
4th Longest
Red has the ________ wavelength.
3rd Longest
The Red Shift explains that because we can see a shade of red in other galaxies, it indicates that the galaxy is moving farther away, which also indicates that the universe is expanding.
Explain the Big Bang Theory.
It starts with all the matter in one small, extremely compact, hot (100 million degrees C) ball.
At some point, all this matter exploded, and begun to spread.
Then, after four minutes, the matter began to cool and form subatomic particles(neutrons, protons, electrons).
After about a billion years, some galaxies began to form.
Cosmology is the study of the changes and the origins of the universe.
What are the differences between spacecraft and aircraft.
Spacecraft usually fly 200 km or more above the Earth's surface, aircraft usually only fly above 20 km.
Aircraft engines require oxygen in the air, spacecraft engines do not.
A piloted spacecraft requires its own fuel and oxygen, while an aircraft only needs fuels.
Spacecraft must travel much, much faster.
What evidence suggest that planets in other solar systems exist?
Many stars that we have seen, seem to have planets about the same distance away from a star as our planets.
Hubble Space Telescope has detected other planetary systems being formed.
The first direct evidence of solid matter existing anywhere other than the sun was found in a large cloud of tiny particles in orbit around the star Vega.
Why do aircraft engines need oxygen.
They use oxygen to burn fuel.
They use oxygen to fly farther.
Why can't aircraft fly very far into Earth's atmosphere?
Lack of oxygen farther in the Earth's atmosphere.
Pilots are afraid of heights.
Why are the wings and rotors curved?
When the wings are curved, low pressure air is pushed to the top and high pressure air is on the bottom, keeping the aircraft aloft.
It helps it fly.
What two forces must balance out for an object to orbit the Earth?
Gravity and Thrust
Pull and Push
Outer Space begins at about 150 km above the Earth's surface.
Describe the different types of spacecraft and give examples of each. Give advantages and disadvantages of each. What do spacecraft have to carry with them?
There high- Earth orbit and low-Earth orbit spacecraft, as well as piloted and unpiloted. The advantages to a low- Earth orbit satellite is that it can remote sense/make observations from a distance, but it would be very difficult to use for TV communication due to the fact that the receivers would have to track the satellite as it moved across the sky.
High- Earth orbit satellites can be used for this type of communication, but would have a harder time seeing the natural disasters and occurrences.
Piloted spacecraft allow man to actually venture space, but can be dangerous and won't go as far.
Unpiloted spacecraft allow us to go farther and not worry about endangering human life or packing food and oxygen.
Payload is any spacecraft or cargo launched into space.
Launchers launch payloads.
The force that causes an object to move is called thrust.
Examples of a payload.
The ISS
Apollo
RADARSAT
Examples of launchers,
Rocket Engines
Stuff
A low-Earth orbit is between 200-1000 km high.
A high Earth orbit is higher than 36000 km.
A geosynchronous orbit satellite uses high earth orbit, while RADARSAT uses low earth orbit.
