The Earth Sun And Moon

Question 1

What is known as the glue of the universe

Answer 1

Gravity

Question 2

What causes day and night

Answer 2

The earth rotating on its own axis every 24 hours

Question 3

What causes seasons

Answer 3

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

Question 4

Why is the amount of energy falling in the northern hemisphere in summer increases?

Answer 4

The length of daytime is increased

The rays hit Earth at right angles, and energy is spread over a smaller area

Question 5

Why does the amount of energy we receive in the northern hemisphere during the winter decreased?

Answer 5

The length of daytime is decreased

The rays hit earth at oblique angles and have to spread their energy over a larger area

Question 6

Why do we see the moon

Answer 6

It reflects light from the sun

Question 7

Why do we see different parts of the moon?

Answer 7

Bc it’s in orbit around the earth for 28 days

Question 8

What is meant by phases of the moon

Answer 8

The change in appearance of the moon as it orbits the Earth

Question 9

The phases of the moon

Answer 9

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

Question 10

Define eclipse

Answer 10

When a celestial body gets in the way of sunlight illuminating another celestial body

Question 11

A lunar eclipse

Answer 11

Sun- earth- moon

Question 12

Solar eclipse

Answer 12

Sun- moon- earth

Only during a full moon

Question 13

Benefits of space exploration

Answer 13

New technologies were developed because there was a need for them for space exploration

Question 14

Give 4 new technologies developed because there was a need for them for space exploration

Answer 14

Satellites, solar panels, battery technology, new materials

Question 15

Give four uses of satellites

Answer 15

GPS - aviation, shipping
Weather
TV signals
Internet

Question 16

How are efficient solar panels used in space

Answer 16

International space station generates electricity to power it

Question 17

How is battery technology used in space

Answer 17

International space station uses it to keep its systems working while in the dark
Used on earth in electric cars

Question 18

Two materials invented for space

Answer 18

Memory foam, scratch proof glass

Question 19

Hazards of space exploration

Answer 19

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