How did the universe begin? -- How big is the universe? -- Where is space? -- What is dark matter and how do we know it exists? -- Where is the center of the universe? -- Why is the universe getting bigger? -- How can we see our own galaxy? -- Where are we in the universe? -- What would happen if the sun was not there? -- What happens when a probe lands on Venus? -- When will we live on other planets? -- How does a flag fly on the moon? -- How do astronauts survive in space? -- Could we live on Mars? -- Have aliens landed on Earth? -- What is time travel? -- Does gravity travel faster than light? -- Will people born in space be able to live on Earth? -- What would happen if you went into a black hole? -- Do constellations break apart? -- Space facts.