Review Space

Other objects, such as comets and asteroids, also orbit the Sun.

Suggest what keeps these other objects in orbit around the Sun.

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The Sun has the strongest gravity in the Solar System.

Suggest which object in the Solar System has the second

strongest gravity.

• Saturn

• Jupiter

• Neptune

• Uranus

• Earth

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Voyager 1 is a space probe launched in 1977. Voyager 1 is now

outside the Solar System and is travelling at 64 000 km/h.

Explain why Voyager 1 could not travel at this speed on Earth.

• Because there are many buildings on Earth

• Because it will be broken on Earth

• Because of air resistance

• Because of vacuum

Which of these forces acts on the Earth as it orbits the Sun?

• Gravity only

• Air Resistance only

• Gravity and Air resistance

• Gravity, Air resistance and Friction

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The orbits of the planets are not exact circles. The distance from the

Sun of each planet varies slightly as it goes around in its orbit. This

change in distance makes the speed of the planet change slightly.

Suggest how the speed of a planet changes with distance from the

Sun during its orbit.

• The further the planet the faster it will orbit around the Sun.

• The closer the planet the faster it will orbit around the Sun.

• The bigger the planet the slower it will orbit around the Sun.

• The smaller the planet the faster it will orbit around the Sun.

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As the distance from the Sun increases, the speed of orbit of the planets

…

• decreases

• increases

• stays the same

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Which explains the advantages of presenting information in a graph rather than in a table?

• This makes it difficult to summarize the result.

• This makes it fun and challenging to do.

• This makes it easy to see if there's an anomalous result.

• This makes it easy to see trends and patterns in the results.

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Think like a scientist: Discovering planets

The planet Uranus was discovered in the year 1781. It was thought to be the most distant

planet from the Sun.

In 1821, a French scientist called Alexis Bouvard made calculations about the orbit of

Uranus. He worked out where Uranus would be at different times.

Question:

The actual orbit of Uranus was different to the calculations.

Which one word best describes these calculations?

• observations

• predictions

• conclusions

• measurements

Think like a scientist: Discovering planets

The planet Uranus was discovered in the year 1781. It was thought to be the most distant

planet from the Sun.

In 1821, a French scientist called Alexis Bouvard made calculations about the orbit of

Uranus. He worked out where Uranus would be at different times.

Question:

The planet was seen to move further away from the Sun at regular times.

These results were recorded.

Which word best describes these results?

• observations

• predictions

• conclusions

• measurements

Think like a scientist: Discovering planets

The planet Uranus was discovered in the year 1781. It was thought to be the most distant

planet from the Sun.

In 1821, a French scientist called Alexis Bouvard made calculations about the orbit of

Uranus. He worked out where Uranus would be at different times.

Question:

Scientists thought that another source of gravity was pulling Uranus further

from the Sun.

Which word best describes this statement?

• observations

• predictions

• secondary information

• measurements

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