Unit D

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Unit D Space Exploration Lesson 4-5 (sec 2.2
and 2.3) Surviving There Technologies for Living
in Space and Using Space Technology to Meet
Human Needs on Earth
2
A. Hazards
no protection

• there is from
  the in space

atmosphere

• outer space is called a
  which means there is no

vacuum
air, water or
atmosphere

• astronauts may be exposed to

cosmic and solar radiation
slide 1 of 7
3

• exposed to

meteoroids and extremes in
temperature

• have to be brought
  along

air and food

• stations and shuttles are
  which can cause

small and cramped
psychological problems
slide 2 of 7
4
B. Microgravity

• is the

force of attraction
between masses
gravity

• varies from

planet to planet

• is the

small
amount of gravity acting on astronauts
microgravity

• are used to the

gravity on Earth
human bodies
slide 3 of 7
5

• in orbit, astronauts experience
  which can

weightlessness
1.
weaken muscles
2.
reduce depth perception
3.
bones lose calcium and become brittle
4.
heart muscle weakens since it doesnt have to
pump as hard
slide 4 of 7
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C. Space Suits

• protect astronauts from

space suits
hazards in space

• space suits contain

1.
layers of different materials
2.
air, water
3.
heating and cooling devices
4.
waste tubes
slide 5 of 7
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D. Water

• water may be

filtered, purified and
recycled many times during long space flights

• International Space Station (ISS) will be
  recycling of its water, including

100
urine
slide 6 of 7
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E. Air

• oxygen is made by

the
electrolysis of recycled water

• 
  are removed from the air

CO2, dust and microbes

• 
  
  are all controlled

temperature, air pressure and humidity
slide 7 of 7
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2.3 Using Space Technology to Meet Human Needs
on Earth
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A. Communication

• 
  depends on

wireless technology
communication satellites
eg) cell phones, satellite TV,
satellite radio

• satellites today use

digital systems
slide 1 of 4
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B. Research Satellites

• are
  designed to

stay in one position above the
Earth
weather satellites

• called

geosynchronous orbit

• ,
  like
  , are in

LANDSAT and RADARSAT
observation satellites
not
geosynchronous orbits

• follow ships at sea, track forest fires, report
  on environmental change etc.

slide 2 of 4
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C. Remote Sensing

• 
  are in a

low orbit (200 km 1000 km
altitude)
remote sensing satellites

• can take of Earths
  surface or

photographs
collect data from sensing heat and radiation
slide 3 of 4
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D. Global Positioning

• 
  are in orbit around Earth

24 global positioning satellites
3

• hand-held receiver picks up signal from of
  the satellites and gives the

precise location
slide 4 of 4
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Assignment

• Worksheet 6