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Curated Video
How Big Is the Universe? Exploring the Scale of Everything
How big is the universe? How big is space? No, it’s much bigger than that.
The sun is a million times bigger t
han earth.
Imagine for a minute that the Sun was the size of this basketball....
The sun is a million times bigger t
han earth.
Imagine for a minute that the Sun was the size of this basketball....
Khan Academy
Radius of Observable Universe, Scale of the Universe, Cosmology and Astronomy
The concept of the universe can be incredibly complex on both physical and mathematical levels. Yet Salman Khan can explain concepts that lead to conclusions about the universe's size. He uses intriguing diagrams and presents information...
Khan Academy
Radius of Observable Universe (Correction), Cosmology and Astronomy
A two-minute video corrects a slight error in the previous Khan Academy video about the observable universe. Sal points out that 300,000 years does not significantly impact the number 13.7 billion, or the estimated time of the Big Bang.
Khan Academy
Khan Academy: Powers of Ten (1977)
Powers of Ten video takes us on an adventure by showing the magnitude of the universe!