9a

Mars is not suitable for human life

A day on Mars lasts 24 hours

A day on Mars lasts 24 hours and 40 minutes

A day on Venus lasts 243 Earth days

Mars has seasons like on Earth

colonists would be able to make water on Mars

Why would colonists be able to make water on Mars?

It is very cold on Mars

there's stronger gravity than on Earth

there's weak gravity on Mars

There is lots of radiation from the Sun

There is much oxygen there

Robots would build underground homes before the colonists arrived

Colonists would live in underground homes

Colonists would grow food in the fields

Colonists would need big greenhouses

Mars might become more like Earth if people sent robots there on spacecraft

Mars might become more like Earth if we sent greenhouse gases there on spacecraft

It takes 8 months to travel to Mars from Earth

It takes 9 months to travel to Mars from Earth

500 people wrote to a magazine about going to a colony on Mars