Gravity Sucks

It's a travesty that Suction (or Pressure, its inverse) isn't considered one of the 4 fundamental forces of the Universe.  After all, without Pressure, the Universe wouldn't be nearly the same as it is:

• The sun would collapse without the pressure from its heated core;
• Our atmosphere would come crashing to the ground without the pressure of heated air and the suction of the vacuum of space;
• The Earth's crust wouldn't drift without the pressure from the expanding magma, meaning our planet would be as flat as the moon;
• Planes and helicopters would be forever grounded without the low-pressure area above the wing/blade sucking the machine into the sky.

There are many, many more instances of how pressure has literally shaped space.  But in a lot of these instances, the force has even more dramatic consequences because of its battle with Gravity.  On the sun, gravity and pressure balance to create a stable (for now) ball of flaming gas.  On earth, gravity holds the atmosphere in balance, creates the heat that presses the surface above the oceans, and prevents airplanes from being sucked into space.

In fact, Gravity has more in common with suction than we give it credit for.  As Einstein explained, Gravity itself stretches spacetime toward the source of the gravity, like a 4-dimensional bowling ball stretching a 3-dimensional trampoline.

This creates a cavity in space toward which things are attracted.  Anything not moving fast enough (even light) will be caught in the Gravity well, and affected accordingly.

Now imagine a ping-pong ball flying quickly by the end of a vacuum in a straight line.  As the ball passes the source of the low pressure, its course will be altered forever.

Just like air, as spacetime stretches, its density gets lower and lower.  And, just like wind, objects rush toward the lowest density.  Every day, we're sucked toward the center of the Earth, that place of lowest spacetime density.