How will our Earth look when seen from a space-ship or Moon ?

Assertion : A star will appear to twink le if seen from free space (say moon) Reason : An air bubbles inside water behave like a convergent lens .

An astronaut orbiting the earth in a circular orbit 120km above the surface of earth, gently drops a spoon out of space-ship. The spoon will

How is a moon different from a planet?

A space-ship is launched into a circular orbit close to the Earth,s surface. What additional speed should now be imparted to the spaceship so that it overcome the gravitational pull of the Earth. Take kinetic energy of the space-ship, K = total energy of space-ship = (GMm)/(2R) where m = mass of space-ship, M= mass of the earth and R = radius of the earth.

When a body is taken from the Earth to the Moon ?

An astronaut orbiting the earth in a circular orbit 120km above the surface of earth, gently drops a ball from the space-ship. The ball will

A closed bottle containing water at 30^(@)C is carried to the moon in a space-ship. If it is placed on the surface of the moon, what will happen to the water as soon as the lid is opened