Decide To Listen • 1989 • episode "5/10" • The Sagan Series

88:57

Planet Earth has been home to humankind for over 200,000 years, but with a population of 7.3 billion and counting and limited resources, this planet might not support us forever. Professor Stephen Hawking thinks the human species will have to populate a new planet within 100 years if it is to survive. With climate change, pollution, deforestation, pandemics and population growth, our own planet is becoming increasingly precarious.

2017 • Astronomy

8:57

It has long been thought that our universe is all there is, but it is possible we may live in just one of many.

The Economist • 2015 • Astronomy

3:52

It's our fate to live in the dark...

2/10 • The Sagan Series • 1989 • Astronomy

6:31

It's hard to get to space.But there is a concept that might make it possible: the space elevator. How exactly does it work.

In a Nutshell • 2016 • Astronomy

12:18

Today we’re rounding out our planetary tour with ice giants Uranus and Neptune. Both have small rocky cores, thick mantles of ammonia, water, and methane, and atmospheres that make them look greenish and blue. Uranus has a truly weird rotation and relatively dull weather, while Neptune has clouds and storms whipped by tremendous winds. Both have rings and moons, with Neptune’s Triton probably being a captured iceball that has active geology.

19 • Crash Course Astronomy • Astronomy

13:40

Our universe is prone to increasing disorder and chaos. So how did it generate the extreme complexity we see in life? Actually, the laws of physics themselves may demand it.

PBS Space Time • 2018 • Astronomy