The simplest answer to why we have day and night is . Earth is a sphere that spins on an invisible line called an axis , which runs from the North Pole to the South Pole.
You might wonder why the Earth keeps spinning. It’s a matter of . When the solar system formed from a collapsing cloud of dust and gas about 4.6 billion years ago, that cloud was already spinning. Because there is almost no friction in the vacuum of space to slow it down, the Earth continues to spin, maintaining the day-night cycle we depend on. 6. The Biological Importance why does day and night occur
It’s because the spin is incredibly steady. We are moving along with the atmosphere and the ground at a constant speed. But don't be fooled by the smooth ride—Earth is rotating at a speed of about (1,600 km/h) at the equator. The simplest answer to why we have day and night is
At that speed, you are literally racing toward the sunrise every morning. It’s a matter of