Phases of the Moon are caused by differing amounts of light reflected from the Earth. Different countries see different phases of the Moon on the same day. The Moon goes around the Earth in a single day. The Moon makes light in the same way the Sun does. Tides are caused by the Moon orbiting the Earth every 24 hours.
Gravity increases with height.
Gravity cannot exist without air. Gravity is caused by the Earth's spin. Rockets in space require a constant force. The Universe contains only the objects in our solar system. Beings from another solar system have visited Earth.