In astronomy, the term perihelion refers to the point in the orbit of an asteroid, comet, or planet at which it is closest to the sun. aphelion refers to the point at which the object is furthest away from the sun. research facts about the dwarf planet ceres. calculate the average orbital speed of ceres in miles/hour when it is closest to the sun and when it is farthest away.

Stars x and y are both bluish main sequence stars. star x has a higher absolute brightness than star y. how do the two stars compare? explain

If steel is more dense that lake water, why can a boat float

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.