Unknown Volume 4 Flashcards

(12 cards)

1
Q

What is dangerous about space travel?

A
  • Potential exposure to high levels of radiation / cosmic rays
  • Pressure difference can lead to accidents
  • Very small objects moving a high speed can damage spacecraft.
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2
Q

How can space travel temperatures be dangerous?

A
  • Extreme temperatures must be intergrated into design
  • Atmosphere re-entry causes extreme high temperatures.
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3
Q

How does newton’s first law affect space travel?

A
  • Fuel accelerate to a velocity. Engines switch off, velocity constant.
  • Thrust to halt motion as there is no friction/opposite force available.
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4
Q

How does newton’s second law relate to take off?

A
  • Take-off acceleration: F = ma
  • Unbalanced take of force = Thrust - Weight
  • Mass decreased as fuel used up. Increases acceleration.
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5
Q

How does newton’s third law relate to space travel?

A
  • Ejecting a part = equal and opposite force on remaining spacecraft.
  • Equal force produced in opposite direction to ejection.
  • Less mass increases acceleration - increaes velocity.
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6
Q

What is the Big Bang Theory?

A
  • The universe orgin: hot, dense
  • Start of universe’s rapid expansion
  • Galaxies moving away show universe is expanding.
  • If it ever stops expanding it may collapse (Big Crunch.)
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7
Q

What is gamma ray astronomy?

A
  • Emmited by pulsars/black holes/ galaxies responsible for high gamma bursts.
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8
Q

What is x-ray astronomy?

A
  • Emitted by extremely hot gases/objects with temerature over one mill kelvin (K)
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9
Q

What is ultraviolet astronomy?

A
  • Emitted by very hot young stars (like sun)
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10
Q

What is infrared astronomy?

A
  • Observateries placed in dry, high altitude locations.
  • Wavelength emitted shows temperature of source.
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11
Q

What is microwave astronomy?

A
  • Space telescopes because little penetrates atmosphere.
  • Detected Cosmic Microwave Background (everywhere)
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12
Q

What is radio astronomy?

A
  • Observations made during cloudy / normal day
  • Emitted by stars / galaxies / quasars, pulars, masers.
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