18:34

Why We May Be Alone in the Universe

14:19

The Fermi Paradox & Interstellar Travel

15:07

The Development of SpaceX's Interplanetary Transport System

15:26

The Colonisation of Mars

06:53

Extragalactic Planets

11:12

Invading Earth Issues

05:48

Black Holes & Hawking Radiation

11:47

Destroying Earth

15:23

The Kardashev Scale & Dyson Spheres

12:12

Von Neumann Probes

15:36

Fermi Paradox: Intelligent Civilizations

06:08

Panspermia: Life From Space

05:02

Colliding Black Holes

04:04

Event Horizon Telescope Update for 2018

05:49

Is Oumuamua A Spaceship?

06:53

Superhabitable Exoplanets

03:30

The Black Hole Collapsing Point

12:59

Mars Colonization Issues

02:59

Gravitational Wave Update

09:24

Primordial Black Holes

05:03

White Holes

08:03

Closest Black Holes and Killing Black Holes

05:53

Where Did the Moon Come From?

10:33

Photographing A Black Hole

11:15

Tabby's Star (3/3)

05:41

Finding Exoplanets (2/3)

02:58

Kepler (1/3)

04:17

GW170104 Update - Third Gravitational Wave Discovered

04:31

An Introduction to Special Relativity

03:04

Mars

02:56

The Cassini Mission

03:05

What Is the Doppler Effect?

02:26

Venus

03:22

Space Plans For 2017

01:57

Dark Energy

02:33

Is the Universe Infinite?

04:26

Mercury

03:11

What Is a Black Hole?

02:13

Seyfert Galaxies

04:36

The Sun

02:42

Is There a Ninth Planet?

01:59

What Are Gravitational Waves?