SatellitesSatellites

D. Crowley, 2008D. Crowley, 2008

SatellitesSatellites

To know how a satellite gets into space, and what they are used for

To know how a satellite gets into space, and what they are used for

Wednesday, April 19, 2023Wednesday, April 19, 2023

GravityGravity

Complete the gravity worksheet

Complete the gravity worksheet

GravityGravity

Force; equal; greater; attractive; mass; gravitational; closer

Force; equal; greater; attractive; mass; gravitational; closer

SatelliteSatellite

What is a satellite?

A satellite is any object that orbits another object

Satellites must travel at a given speed to stay in their orbits

There are two types of satellite: - – Natural satellites– Artificial satellites

What is a satellite?

A satellite is any object that orbits another object

Satellites must travel at a given speed to stay in their orbits

There are two types of satellite: - – Natural satellites– Artificial satellites

Natural SatellitesNatural Satellites

The moon is the natural satellite of the Earth

Gravitational forces between the moon and the Earth keep it in orbit

The moon is not a luminous object (it does not make its own light) but it does reflect light from the Sun

The moon is the natural satellite of the Earth

Gravitational forces between the moon and the Earth keep it in orbit

The moon is not a luminous object (it does not make its own light) but it does reflect light from the Sun

A satellite has to travel at the correct speed to stay in orbit at a particular distance from a planet. It takes the moon 28 days to make a complete orbit of the Earth (as it orbits, we see different amounts of the moon (different phases))

A satellite has to travel at the correct speed to stay in orbit at a particular distance from a planet. It takes the moon 28 days to make a complete orbit of the Earth (as it orbits, we see different amounts of the moon (different phases))

Artificial SatellitesArtificial Satellites

An artificial satellite is an object made by and put into orbit by humans

Artificial satellites can have different type of orbits: -– Geostationary satellites– Polar orbit satellites

There are lots of artificial satellites in orbit around the Earth and they have many different uses, including: -– Communications, (TV broadcasting, telephone relays etc…)

– Global Positioning System (GPS) & Galileo satellites for navigation

– Weather forecasting

– Scientific surveys of the Earth's surface & space (e.g. Hubble)

– Map making

– Spying

An artificial satellite is an object made by and put into orbit by humans

Artificial satellites can have different type of orbits: -– Geostationary satellites– Polar orbit satellites

There are lots of artificial satellites in orbit around the Earth and they have many different uses, including: -– Communications, (TV broadcasting, telephone relays etc…)

– Global Positioning System (GPS) & Galileo satellites for navigation

– Weather forecasting

– Scientific surveys of the Earth's surface & space (e.g. Hubble)

– Map making

– Spying

Geostationary SatellitesGeostationary Satellites

Stay above the same point on Earth

Speed of orbit matches the Earth’s rotation, so orbit time is 24 hours

Used for communications, satellite TV, weather forecasting, intelligence, global positioning etc…

Stay above the same point on Earth

Speed of orbit matches the Earth’s rotation, so orbit time is 24 hours

Used for communications, satellite TV, weather forecasting, intelligence, global positioning etc…

Polar Orbit SatellitesPolar Orbit Satellites

Low orbit around the Earth, passing over North and South poles

Earth rotates underneath them as they orbit

Used for large-scale mapping and global weather monitoring

Low orbit around the Earth, passing over North and South poles

Earth rotates underneath them as they orbit

Used for large-scale mapping and global weather monitoring

SatellitesSatellites

Space TravelSpace Travel

How difficult is it to get into space?

What about getting to the moon?

How about other planets… or solar systems?!

Space travel is never routine - it is extremely dangerous (space is very hostile) and if a rocket malfunctions you don’t usually walk away…

How difficult is it to get into space?

What about getting to the moon?

How about other planets… or solar systems?!

Space travel is never routine - it is extremely dangerous (space is very hostile) and if a rocket malfunctions you don’t usually walk away…

Going To The MoonGoing To The Moon

Complete the going to the moon worksheet

Complete the going to the moon worksheet

Going To The MoonGoing To The Moon

Lots of Earth’s gravity

Gravity of Earth still strong

Moon’s gravity affects lander

Moon’s gravity tries to pull

orbiter down

Moon’s gravity affects lander

Moon’ gravity still affects space craft

Moon’s gravity weakens,

Earth’s increases

Earth’s gravity very strong