Planet Earth

The days that could change Earth © Getty Images

The days that could change Earth

Where will all the oil from Deepwater Horizon go? © Getty Images

Where will all the oil from Deepwater Horizon go?

How long has Antarctica been frozen? © Getty Images

How long has Antarctica been frozen?

How far away is the horizon? © Getty Images

How far away is the horizon?

How are the seismometers that measure earthquakes calibrated? © Getty Images

How are the seismometers that measure earthquakes calibrated?

How much does human breathing contribute to climate change? © Getty Images

How much does human breathing contribute to climate change?

How much does a cloud weigh? © Getty Images

How much does a cloud weigh?

How close do you have to be to a lightning strike in the sea for it to shock you? © Getty Images

How close do you have to be to a lightning strike in the sea for it to shock you?

Why are sunsets red? © Getty Images

Why are sunsets red?

World's most extreme science labs © Getty Images

World’s most extreme science labs

What causes the Northern Lights? © Getty Images

What causes the Northern Lights?

Why are clouds white? © Getty Images

Why are clouds white?

What is the ratio of males to females on the planet? © Getty Images

What is the ratio of males to females on the planet?

What makes the rock inside volcanoes so hot? © iStock

What makes the rock inside volcanoes so hot?

How much of the Earth's oceans have been explored? © Getty Images

How much of the Earth’s oceans have been explored?