SciShow
How Many Stars Are There?
How many stars are there in the universe? This question leads Hank to a couple other questions - How many stars can we see from Earth? How many stars are there in our galaxy? - but the answer to the original question proves elusive.
SciShow
The Biggest Stars in the Galaxy
Learn about hypergiant stars -- stars that make the sun look ridiculously tiny.
PBS
The Missing Mass Mystery
For years, astronomers have been unable to find up to half of the baryonic matter in the universe. We may just have solved this problem.
SciShow
3 Ways Exoplanets Rocked Planetary Science
Exoplanets have taught us a lot more about planets than our solar system could ever teach us, from what happens when they’re born, to what happens when their stars die.
Crash Course
Skyscrapers, Statics, & Dynamics: Crash Course Engineering #26
What if you were on a high floor of a skyscraper and the building started swaying? Today we’ll explore statics and dynamics, and what they mean for the structures we design. We look at the idea of static equilibrium, forces, and torques,...
Bozeman Science
AP Biology Lab 1: Diffusion and Osmosis
Paul Andersen starts with a brief description of diffusion and osmosis. He then describes the diffusion demonstration and how molecules move over time. He then explains the concepts behind the osmosis lab and how potatoes are affected by...
Be Smart
Does The Moon Really Orbit The Earth?
According to Newton's law of gravitation, the sun should "pull" way harder on the moon than the Earth does. So does the moon actually orbit the Earth? Why?
SciShow
How Big Can Black Holes Grow?
Black Holes are known for consuming everything that falls into them, but is there a point where these galactic devourers can't stomach anymore?
Bozeman Science
Nuclear Reactions
Mr. Andersen contrasts nuclear reactions to chemical reactions. He explains the four main forces of nature; including gravity, electromagnetism, strong, and weak nuclear forces. He also explains how fusion differs from fission.
SciShow
Neutron Stars Just Keep Getting Weirder
Neutron stars are some of the strangest things in the universe, but are they the source of the mysterious Fast Radio Bursts? Or is it aliens? Spoilers: probably not aliens.
Crash Course
Brown Dwarfs
While Jupiter is nowhere near massive enough to initiate fusion in its core, there are even more massive objects out there that fall just short of that achievement as well called brown dwarfs. Brown dwarfs, have a mass that places them...
SciShow
Why Is Pluto Not A Planet?
Pluto's not a planet. We're sorry, but we think it's time you move on. If you've gone through all your breakup music and Meg Ryan movies, and you still can't get over it, then SciShow Space will get out the ice cream, cuddle up with you...
Bozeman Science
Mole Conversions
Mr. Andersen shows you how to convert moles to grams and moles to molecules.
Bozeman Science
Center of Mass
In this video Paul Andersen explains how the center of mass of an object represents the average position of matter in an object. The center of mass of a system is a combination of all the objects within the system. As long as no external...
SciShow
How Do You Weigh Things in Space?
Astronauts need to know their mass while in orbit, but a normal scale would be free-falling around the Earth with them. So how do they measure their mass without gravity?
PBS
Could You Fart Your Way to the Moon?
Listen, we know you've thought about it, and we're here to give you THE DEFINITIVE ANSWER to one of the greatest science questions of all time. How long would it take to get to the MOON by farting? Join Gabe on PBS Space Time as we walk...
SciShow
Using Sunlight to Propel Spaceships
When scientists are planning missions, they sometimes have to take into account the fact that the light from the Sun pushes on the spacecraft. But with solar sails, they can also use that pressure to propel the craft along.
Bozeman Science
Continuity Equation
In this video Paul Andersen explains how the continuity equation is an application of conservation of matter in a fluid. The continuity equation may apply to either mass or volumetric flow. Example problem and examples are included.
Be Smart
What is Wind?
Wind is everywhere. The air is constantly moving, sometimes gently, sometimes violently. Why? Pressure, temperature and rotation come together to make wind. Here's how.
SciShow
Is There Gravity in Space
In a word, "yes" - space is packed with gravity. Hank explains how Isaac Newton described how gravity works, and why even though it seems that things are floating in space, they're still effected by gravity. Every object in the universe...
Crash Course Kids
Over (to) The Moon
Sabrina gets a new set in this episode of Crash Course Kids. Do you want to be an astronaut? Would you like to someday walk on the moon? Well, you better learn a little about gravity so you can escape from Earth and head into space....
Bozeman Science
Rotational Motion
In this video Paul Andersen explains how a net torque acting on an object will create rotational motion. This motion can be described by the angular displacement, angular velocity, and angular acceleration. The linear velocity can be...
Bozeman Science
Radiation and Radioactive Decay
Mr. Andersen explains why radiation occurs and describes the major types of radiation. He also shows how alpha, beta, and gamma radiation affect the nucleus of a radioactive atom. Nuclear equations are also discussed.