I’m having a hard time understanding this. From what I have read, a vacuum is a space that is devoid of matter. But there is matter in Space (planets, chemical compounds, stars, etc.). There is something I’m missing here and I’m not understanding
In: Physics
You’re not really missing anything, it’s just a matter of semantics.
We typically ignore the places where matter has clumped together due to gravity – ie. celestial objects like stars, planets, moons, asteroids etc. But whether you exclude those objects or not, space is just so massive and close enough to empty that it is, for all intents and purposes, a vacuum. It’s not a *perfect* vacuum though.
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