Date: Around 1999
Why is it so hard to quantify gravity?
It isn't. Gravity can be measured by producing a
local acceleration which cancels it out. Gravity is
exactly detectable as a local acceleration and can be
precisely measured. The biggest problem with gravity is
that it enters into the equations of motion for a particle
as a part of space and time. This means that we have to
find out the structure of space from the distribution of masses
and then find the motion in that warped space. This is difficult.
Another aspect of gravity is that it is very weak. The excitations
of gravity, the gravitons are expected to exist, but are so weak that
none can seem to measure them. Many have tried for several years.
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Update: June 2012