The Earth...its size is perfect. The Earth's size and
corresponding gravity holds a thin layer of mostly nitrogen and oxygen gases,
only extending about 50 miles above the Earth's surface. If Earth were smaller,
an atmosphere would be impossible, like the planet Mercury. If Earth were
larger, its atmosphere would contain free hydrogen, like Jupiter.3
Earth is the only known planet equipped with an atmosphere of the right mixture
of gases to sustain plant, animal and human life.
The Earth is located the right distance from the
sun. Consider the temperature swings we encounter, roughly -30 degrees to +120
degrees. If the Earth were any further away from the sun, we would all freeze.
Any closer and we would burn up. Even a fractional variance in the Earth's
position to the sun would make life on Earth impossible. The Earth remains this
perfect distance from the sun while it rotates around the sun at a speed of
nearly 67,000 mph. It is also rotating on its axis, allowing the entire surface
of the Earth to be properly warmed and cooled every day.
And our moon is the perfect size and distance from the Earth for its
gravitational pull. The moon creates important ocean tides and movement so ocean
waters do not stagnate, and yet our massive oceans are restrained from spilling
over across the continents.4