Understanding gravity: How mass and matter explain its existence
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How to build a starship – and why we should start thinking about it now
Summary
This article explores the relationship between gravity and mass, explaining that gravity exists wherever there is mass. It defines mass as a measure of matter, and matter as the physical substance that makes up stars, planets, atoms, and everyday objects. The article notes exceptions like light, sound, and feelings, which are not matter. It frames the question of when gravity began in terms of when mass first came into existence.
Source
Twitter / XUnderstanding gravity: How mass and matter explain its existenceuniversal-sci.comKey quotes
· 5 pulled'Mass' is what we use to measure how much 'matter' there is.
Scientists use the term 'matter' to describe stuff like stars, planets, oceans, rocks, molecules, atoms, particles like electrons and protons that make up atoms, and even the particles that make up electrons and protons.
Very nearly everything you encounter in everyday life counts as 'matter': a book, a glass of water, a bird – anything you might also call 'stuff'.
There are some exceptions: for example, neither light nor sound is matter, nor are feelings.
Light can even travel through completely empty space, where
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