New High School Graduation Requirements. House Bill 487 updated Ohioâs graduation requirements to ensure that all students are ready for success in college and work. As a result, the Class of 2017 (10th-graders in the 2014-2015 school year) will be the last students to take the current Ohio Graduation Tests. Click here for additional information.
The right-hand rule helps amateur astronomers understand axial tilt. When the fingers of the right hand are curled in the direction of the planet's rotation, the thumb points in the direction of the planet's North Pole. An axis is an invisible line around which an object rotates, or spins. The object can be a tiny particle, smaller than a single atom. Or it could be a star with the mass of a thousand suns.
Gravity is a force that causes planets to form the shape of a sphere by pulling the mass of the planet close to the center of gravity. In the case of the Earth, gravity pulls the planet as close to the core as possible. The sphere-like shape of the Earth is distorted slightly by the centrifugal force of its rotation. This force causes the mass of the planet to move away from the center of gravity, which is located at the equator.