The Gravity Of It All! -
Gravity is important to us because without Earth's pull, nothing would
stay put on the surface of the Earth-not even us! In our solar system, the
sun's attractive forces keep the Earth in orbit around the sun.
Isaac Newton -
Isaac Newton contributed many things to our scientific understanding of
the world. He developed the theory of gravity, the laws of motion, which
evolved into our modern physics, and a new kind of mathematics which
he called "fluxions," but which we know as the calculus that we still use
today. He also made discoveries in the field of optics, like the reflecting
The Theory of Relativity -
Albert Einstein was born in Germany in 1879, and spent most
of his childhood there. His father, who owned an electronics
company, taught him a lot about science and electronics.
Einstein studied mathematics and science in school.
Escape Velocity -
The dividing line between Earth's atmosphere and space is a little over 62
miles (100 km) above Earth's surface. The higher you get above the
surface of the Earth, the thinner the gases get that comprise Earth's
atmosphere77.5% of these gases are concentrated in the first seven miles
of the atmosphere. 99% are within the first 20 miles.
QUESTIONS: Escape Velocity -
What happens to the gases that comprise the Earth's atmosphere the
higher up you get above the surface of the Earth?
Gravitational Time Dilation -
Gravitational Time Dilation is the measurement
of how much time has elapsed between two
observers experiencing the same event, but
situated at different distances from a
gravitational mass. Put more simply, time moves
more slowly where gravity is the strongest,
because item curves space-time.
Gravity and Motion -
The Earth pulls on every object on its
surface, keeping us attached to it. All objects in the universe that have
mass exert a gravitational pull or force on other objects with mass. The
larger the object, the greater the force.
Is There Gravity In Space? -
Every object subject to Earth's pull moves at the same acceleration
towards the Earth. For instance, if you drop a penny and a book from the
same height, they will be pulled back down towards Earth's surface by
gravity at the same rate of acceleration.
Is Artificial Gravity Possible? -
In films like Star Trek and Star Wars, people walk around inside spaceships
as if they were walking in a building on the Earth-that is, as if they were
subject to Earth's pull.
Gravitational Waves -
The strongest gravitational waves are created as a
result of cataclysmic events like black holes
colliding. Some believe that there are gravitational
waves that are left over from the birth of the
Gravitational Lensing -
The work of Albert Einstein forever changed how we view the universe.
While Newton imagined it as an unchanging backdrop to our planet,
Einstein recognized it as a dynamic system constantly changing as it is
influenced by mass and energy.