Question

why earth axis tilted to 23.5 degrees......

Answer 1

Astronomers theorize that over 4.5 billion years ago, “Theia” an object about the size of Mars, collided with Earth to create atilted axis. This is called "the giant impact theory." ... Scientists named Theia after the Greek god Titan. The 23.5-degree tilt of the axis sustains life on Earth and produces seasons.

Answer 2

Astronomers theorize that over 4.5 billion years ago, “Theia” an object about the size of Mars, collided with Earth to create a tilted axis. The 23.5-degree tilt of the axis sustains life on Earth and produces seasons.