He digs up a plutonium containing generator

Trick question - Mars is warm even at night due to the atmosphere being predominantly CO₂ ( - the greenhouse effect of/on the entire planet means that Mars is just as warm at night as it is during the day)

He uses the heater in his spacesuit (plugged into the Rover's power supply) 

He modifies the Rover's cockpit, creating a greenhouse like structure that traps the heat from the Sun

He uses additional solar panels to power the Rover's heaters

He finds supplies in a ship from another (cancelled) mission

Mark is able to repair the replicator and can then synthesize more food

He grows potatoes using soil fetralised with human faeces

N.A.S.A. sends supplies on a Chinese rocket

Mark turns to cannibalism

He is hit by debris which leads the crew to believe that he is dead

It was part of the mission, N.A.S.A. wanted to see if a man could survive for an extended period of time on Mars

He choose to remain behind so that the rest of the crew could escape

He was injured so would not have survived the ascent

The rest of the crew mutinied and left Mark there

He was suspected to have an illness

He had a falling out with the Mission Commander

He had an accident in training which resulted in him breaking his arm

He was too short for the CM

He was too tall for the CM

Mission control intentionally do not communicate so that the astronauts can concentrate.

The crew were angry with mission control so intentionally did not respond.

The radio antenna came off during re-entry so they could not contact mission control until after they had landed

The crew lost power.

Heat from re-entry creates ionized radiation which disrupts communication.

They produce O₂ that the crew was running out of.

They remove CO₂ from the air.

All of the answers are correct.

They did not want to leave any equipment behind once they jettisoned the service module.

N.A.S.A. needed to keep the astronauts busy so they would not get hypothermia.

Neil Armstrong

Jeffrey Kluger

Jim Lovell

Fred Haise

Buzz Aldrin

4.

3.

5.

2.

A different number.

Aliens have declared a no-fly zone around our solar system

There are no other suns, so the absence of light means it is very difficult to find other planets (as they are black against a black background).

We are limited by the speed of light, it would take a long time to get anywhere without 'new technology'

Ever since The Big Bang the universe has been expanding, this means that the distance between out solar system and another is constantly increasing. This expansion is occurring at such a rate that we will never be able to go fast enough to overcome the increasing distance.

We live in a simulation that ends at the edge of our solar system

Jupiter

Venus

Mercury

Mars

Saturn