1. At what weight would an astronaut of 90 kg mass have on the surface of the Moon? 2. The acceleration due to gravitation on Earth's surface is not the same at each point on Earth. It varies for several reasons - one example being the inhomogeneity of mass distribution within Earth or that our planet is not a perfect uniform sphere. What effects can such small variations have in our daily life?

3. There are different levels of gravity on other planets, moons or even asteroids and comets. How can this affect exploring and maybe even living and working on these celestial bodies. What will be easier to do, what will be more difficult?

4. Humans (like all other beings on Earth) are adjusted to 1 g acceleration. When astronauts and cosmonauts are working and living in space - like on the International Space Station - the resulting weightlessness has significant influence on their human bodies. How can research on such life sciences issues help with medical issues on Earth?

Please help, and explain it to me please!