Airplanes stay up in the air due to a combination of aerodynamic forces and engine propulsion. When an airplane moves forward, its wings generate lift, primarily through the shape of the wing and the airflow over and under it.

The possibility of discovering aliens remains uncertain, but ongoing scientific efforts may lead to intriguing revelations in the future.

The moon is visible during the day because its position relative to the Earth and the sun allows sunlight to illuminate it.