Astronomy
Understanding the Interstellar Medium and Its Molecular Clouds
Quick fact
The interstellar medium is not truly empty: it contains about 10% of the galaxy's mass, and it's from the cold, dense molecular clouds within it that new stars are born.
Why this is interesting
When you look at the night sky, you might think that space between the stars is completely empty. But what if that "emptiness" is actually the raw material for new stars?