The Earth Sun And Moon
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What is known as the glue of the universe
Gravity
What causes day and night
The earth rotating on its own axis every 24 hours
What causes seasons
The way the earth is tilted on its axis as it rotates around the sun, so that different parts get different levels of exposure to the sun during the year
Why is the amount of energy falling in the northern hemisphere in summer increases?
The length of daytime is increased The rays hit Earth at right angles, and energy is spread over a smaller area
Why does the amount of energy we receive in the northern hemisphere during the winter decreased?
The length of daytime is decreased The rays hit earth at oblique angles and have to spread their energy over a larger area
Why do we see the moon
It reflects light from the sun
Why do we see different parts of the moon?
Bc it’s in orbit around the earth for 28 days
What is meant by phases of the moon
The change in appearance of the moon as it orbits the Earth
The phases of the moon
New moon: can’t see from earth First quarter: half of the lit side Full moon : all of the illuminated part Third quarter: half the lit side New moon again
Define eclipse
When a celestial body gets in the way of sunlight illuminating another celestial body
A lunar eclipse
Sun- earth- moon
Solar eclipse
Sun- moon- earth Only during a full moon
Benefits of space exploration
New technologies were developed because there was a need for them for space exploration
Give 4 new technologies developed because there was a need for them for space exploration
Satellites, solar panels, battery technology, new materials
Give four uses of satellites
GPS - aviation, shipping Weather TV signals Internet
How are efficient solar panels used in space
International space station generates electricity to power it
How is battery technology used in space
International space station uses it to keep its systems working while in the dark Used on earth in electric cars
Two materials invented for space
Memory foam, scratch proof glass
Hazards of space exploration
Rockets can explode like Challenger On re entry the spaceship can burn Depend on technology to make water and oxygen Expensive, unjustified spending Unethical to send people to mars Send robots instead of people in future