This video is from the Khan Academy subject of Science on the topic of Cosmology and astronomy and it covers Accreting mass due to gravity simulation.

Out in the vast coldness of outer space, there are planets that travel alone through darkness without the boundaries of a system. Here's how this can happen - and why these frozen deserts might secretly harbor alien life. The video "Aliens under the Ice - Life on Rogue Planets" is a resource included in the Space sciences topic made available from the Kurzgesagt open educational resource series.

The video resource "The Anthropocene and the Near Future: Crash Course Big History #9" is included in the "Big History" course from the resources series of "Crash Course". Crash Course is a educational video series from John and Hank Green.

Are you alone? To answer this question we have to take a look what "you" are first. What are you made of and where you stand in this universe. Are you your body? Your atoms? And how are your parts connected to the big picture? The video "Are You Alone? (In The Universe)" is a resource included in the Space sciences topic made available from the Kurzgesagt open educational resource series.

The video resource "Asteroids: Crash Course Astronomy #20" is included in the "Astronomy" course from the resources series of "Crash Course". Crash Course is a educational video series from John and Hank Green.

Astronomy is designed to meet the scope and sequence requirements of one- or two-semester introductory astronomy courses. The book begins with relevant scientific fundamentals and progresses through an exploration of the solar system, stars, galaxies, and cosmology. The Astronomy textbook builds student understanding through the use of relevant analogies, clear and non-technical explanations, and rich illustrations. Mathematics is included in a flexible manner to meet the needs of individual instructors.

This edition of the OpenStax Astronomy text has been edited by Douglas College’s Jennifer Kirkey (to whom my thanks go for help in transitioning to OpenStax) to include references to Canadian astronomers as well as the contributions of our First Nations. I am open to your comments and suggestions regarding the textbook. Because it is open source, it can be edited and updated to suit your needs and wishes.

How did everything get started? Has the universe a beginning or was it here since forever? Well, evidence suggests that there was indeed a starting point to this universe we are part of right now. But how can this be? How can something come from nothing? And what about time? We don't have all the answers yet so let's talk about what we know. The video "The Beginning of Everything - The Big Bang" is a resource included in the Physics topic made available from the Kurzgesagt open educational resource series.

The video resource "The Big Bang, Cosmology part 1: Crash Course Astronomy #42" is included in the "Astronomy" course from the resources series of "Crash Course". Crash Course is a educational video series from John and Hank Green.

The video resource "The Big Bang: Crash Course Big History #1" is included in the "Big History" course from the resources series of "Crash Course". Crash Course is a educational video series from John and Hank Green.

This video is from the Khan Academy subject of Science on the topic of Cosmology and astronomy and it covers Big Bang Introduction.

The video resource "Binary and Multiple Stars: Crash Course Astronomy #34" is included in the "Astronomy" course from the resources series of "Crash Course". Crash Course is a educational video series from John and Hank Green.

The video "The Black Hole Bomb and Black Hole Civilizations" is a resource included in the Space sciences topic made available from the Kurzgesagt open educational resource series.

The video resource "Black Holes: Crash Course Astronomy #33" is included in the "Astronomy" course from the resources series of "Crash Course". Crash Course is a educational video series from John and Hank Green.