-- The speed of the orbiting body is the same at every point in its orbit.
-- Since a circle is the ellipse with coincident foci, the central body is at the center of the circular orbit.
-- The radius of the circular orbit drawn from the central body to the orbiting body sweeps out the same amount of area in every same amount of time.
-- The forces of attraction between the central body and the orbiting body may be electrostatic, magnetic, or gravitational.
-- The circular orbit never occurs in nature. In the case of TV satellites that appear 'fixed' in the sky, their orbits must constantly be adjusted to maintain circularity and prevent them from drifting off station..
CH4 is joined together by a covalent bond, aka a bond between two non-metals. Non-metals are found on the right side of the periodic table and include Carbon (C) and Hydrogen. Although Hydrogen is technically on the left side of the table, it has the characteristics of a non-metal. Futhermore, Ionic bonds generally are between an element on the right joined with an element on the left. This is because ionic bonds want charges that will cancel out to create a neutral molecule.