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The sky appears blue because of a phenomenon called Rayleigh scattering. When sunlight enters the Earth's atmosphere, it interacts with the molecules of the air, primarily nitrogen and oxygen. These molecules scatter the shorter wavelengths of light (blue and violet) more effectively than the longer wavelengths (red, orange, and yellow). This scattering of blue light makes the sky appear blue.

Whether or not we will ever discover aliens is a question that remains unanswered. While there is no definitive proof of extraterrestrial life, the vastness of the universe suggests the possibility. Ongoing research and exploration in astrobiology and space science continue to search for signs of life beyond Earth.

The Earth's mass is approximately 5.972 × 10^24 kilograms (1.317 × 10^25 pounds).

Airplanes stay up due to the principles of lift, thrust, drag, and weight. Lift is generated by the shape of the airplane's wings, which creates a difference in air pressure above and below the wing, causing it to rise. Thrust is generated by the engines, propelling the airplane forward. Drag is the force that opposes the motion of the airplane through the air. Weight is the force of gravity pulling the airplane down. For an airplane to fly, the lift generated by the wings must be greater than the weight of the airplane.