“The cosmos is also within us, we're made of star-stuff. We are a way for the cosmos to know itself.” - Carl Sagan Compared to the Sun, how big is the Earth? What is a scale model and how does it help ...

From subatomic particles to galaxies billions of light-years away, the scale of the universe is beyond mind-blowing—yet most of us can barely grasp it. This video breaks down the cosmic vastness step ...