Be Smart
How Many Stars Are There?
Starting with a seemingly simple question, a video covers how many stars are visible with the human eye. Then it explains how many stars are in the Andromeda galaxy next to ours. The most interesting part is when you view a single square...
Khan Academy
Detectable Civilizations in our Galaxy 4
Mr. Khan works through the equations that he derived in previous videos. In this fourth video of in a series of five, he uses an equation that he created himself.
Khan Academy
Detectable Civilizations in our Galaxy 3
This lecture continues the calculations involved in deducing the number of possible detectable civilizations. The main subject is a comparison of the traditional Drake equation and the calculations made in the previous videos in this...
Khan Academy
Detectable Civilizations in our Galaxy 1
Sal outlines a framework for detecting possible civilizations in our universe. He considers the number of stars and uses the requirements for civilizations to derive the number of potentially suitable planets. The Drake equation can help...
TED-Ed
Can You Solve the Dark Matter Fuel Riddle?
Space captains must figure out how to reach an abandoned alien space station before any other species in the galaxy. The problem? Where to store caches of fuel along the way. Viewers needn't be aliens to figure out this riddle.
Veritasium
Spinning Black Holes
Why is the spin of a black hole important? Scholars explore spinning black holes and how they relate to momentum, matter, and mass. They investigate the different parameters that are used to measure black holes by understanding how...
Be Smart
Seeing a Black Hole with a Planet-Sized Telescope
When did scientists first view a black hole? Believe it or not, it was 2019! It took a century for the theoretical to become a reality, and a lesson from the larger It's Okay to be Smart series discusses the structure of the black hole...
Veritasium
First Image of a Black Hole!
Have scholars ever wondered what a black hole looks like? See the first image of a massive black hole and learn about what a black hole is, how it forms, and how telescopes took images from around the world. The video then relates the...
Veritasium
How to Understand the Image of a Black Hole
What is a black hole? Individuals hear a detailed explanation about what a black hole is, how it forms, and how it effects light and matter. The characteristics of a black hole determine the image it produces in telescopes, and...
SciShow
A New Origin Story for Mars's Moons
The brightest and densest protocluster ever observed by scientists makes that area the most active region of space. Learn about the area and the formation of galaxies before our eyes as part of the SciShow Space series. Hank Green also...
SciShow
3 Things We Still Don't Understand about the Milky Way
Oops, something bumped into us! Scientists research what bumped into our galaxy, when, and where it went after the collision. Part of a larger SciShow Space series, an interesting video presents three mysteries, including the collision....
SciShow
Red Nugget Galaxies: The Universe's Ultimate Survivors
Time capsules offer a glimpse into the past, and red nugget galaxies are the time capsules of the universe. Using an installment from the SciShow Space series, viewers explore the discovery of new red nugget galaxies. The video also...
SciShow
Solving Mysteries with the Ancient Galaxies Next Door
Tiny, old galaxies surrounding the Milky Way offer an opportunity to observe the evolution of the universe. An episode of the SciShow Space series describes what scientists knew before and the new research recently published on the...
SciShow
How Do We Know What the Milky Way Looks Like?
Imagine describing what something looks like when you've only seen it from the inside. That's the task astronomers tackle when describing the shape and characteristics of the Milky Way. Using a combination of physics and mathematics,...
SciShow
How Many Galaxies Are There?
Could there really be over 200 billion galaxies? It turns out the number may be closer to two trillion galaxies! A video presentation discusses the existence of galaxies in the universe. The narrator explains how scientists make...
TED-Ed
The Life Cycle of a Neutron Star
From supernova to neutron star ... what's next? A video presentation describes a neutron star and its life in the universe. Learners then answer questions online to asses their understanding.
PBS
Tour of the Universe
Understanding the size of the universe and its many galaxies challenges perceptions, and this visual journey through the universe helps create a scale. Starting from Earth and going out past our galaxy, thus backwards in time, the entire...
Physics Girl
What's in the Darkest Part of the Sky? The Hubble Deep Field
Prepare to be amazed! Look deep into the darkest part of the night sky, courtesy of a video from a vast physics playlist. Young astronomers see hundreds of galaxies through the eye of the Hubble Telescope.
Physics Girl
What Is Dark Matter? A Mystery of the Universe
If you can't see something, how do you know it's there? Welcome to the mystery of dark matter! Curious cosmologists explore one of physics' longest-running quandaries through an interesting video. Content includes who first proposed the...
SciShow
The Smallest Star in the Universe
They may be small, but probably still mighty! The characteristics of what astronomers have defined as stars have a minimum size requirement. The tiniest stars pack a lot into a small package—and still have all the properties of their...
SciShow
Zombie Stars Discovered!
The walking dead of the sky have been discovered! As a recent discovery, much is yet to be determined, but it is clear zombie stars do exist. An episode of a larger solar system playlist explains how a special supernova leaves behind...
SciShow
Does the Sun Have Long-Lost Siblings?
The sun is missing a few branches from its family tree! A fact-filled lesson from a solar system playlist describes the characteristics of our sun that help identify its siblings. Stars that form from the same cloud typically have the...
SciShow
The Biggest Stars in the Galaxy
Study the giants of our universe with a video lesson. A descriptive lesson from a solar system playlist compares hypergiant stars to other bodies in our galaxy. The lesson instructor explains the origin and the composition of these...
SciShow
The Fastest Runaway Star in the Galaxy
There's one in every group! It turns out there are rouge stars in our universe that don't follow the rules. An episode of an extensive solar system playlist describes the behavior of hypervelocity stars and how they interact in our...