3. WHAT IS GRAVITATION?
• Gravity, or gravitation, is a
natural phenomenon by
which all things with mass
are brought toward one
another, including planets,
stars and galaxies.
4. NEWTON'S THEORY OF GRAVITATION.
• Who is Newton?
• Theory of Gravitation.
5. WHAT IS COSMOLOGY?
• Cosmology is the branch of
astronomy involving the origin and
evolution of the universe, from the
Big Bang to today and on into the
future