That explanation that &quot;things are always moving - through time&quot; is exactly correct. You need to think of the full four dimensional spacetime. It is that spacetime which is curved rather than just space.<p>The crucial concept is Newton&#x27;s first law (objects continue on their trajectory if a force is not applied). The straight lines in the 4D spacetime (geodesics) - the lines that an object would follow if no force is applied - correspond to the paths that look as if a gravitational force is applied.