Unknown Volume 3

Question 1

What does the hubble telescope do?

Answer 1

• Can absorve the whole sky, night and day.
• Difficult/expensive to maintain space telescope, but they give images far more detailed than those that can be taken on Earth.

Question 2

James webb?

Answer 2

• Launched 2021
• Provides excellent high quality definition

Question 3

What are communications with satellites?

Answer 3

• Signals recieved by satellite, amplified then retransmitted on different frequency back to earth.

Question 4

ISS?

Answer 4

• Initially launched 1998. Originally intended to be laboratory, observatory and factory.
• Provide transportation, maintenance and a low Earth orbit staging base for possible future missions to reach the Moon, Mars and asteroids.

Question 5

Satellite GPS?

Answer 5

• Finds position by measuring distance between itself and at least three others (trilateration).
• Measures how long it takes for signal to reach it. Each signal gives more likely location, more signals more accurate location/height indicated.

Question 6

How can travelling long distances be aided?

Answer 6

Attaining higher velocity by using ion drives (producing small unbalanced force over extended period of time.)

Question 7

What are gravity assists?

Answer 7

• ‘Catapult’ from fast moving asteroid, moon / planet
• Accelerates towards but misses it
• Accelerate due to force of gravity and increase its velocity / change direction of travel

Question 8

What are some other challenges with space travel?

Answer 8

• Manouvering a spacecraft in a zero friction environment (like docking with ISS).
• The journey getting to and landing on another planet is complicated by having a return journey.

Question 9

How does energy work in space travel?

Answer 9

• Sustaining enough energy to operate life support. (Using solar cells is a solution).

Question 10

Why is take-off challenging?

Answer 10

• Huge amounts of energy required to get into orbit.
• Heavier the spacecraft, more fuel required which increases risks.

Question 11

What is refraction?

Answer 11

When waves pass from one medium to another.

Question 12

What happens when waves enter more dense material?

Answer 12

• Wavelength decreases
• Wave speed decreases
• Bends towards normal
• Frequency and colour remains constant

Question 13

What happens when waves enter less dense material?

Answer 13

• Wave length increases
• Wave speed increases
• Bends away from normal
• Frequency and colour remains constant.