Which phrase best describes the heliocentric model of the solar system?

On nights when we see the new moon phase, what side of the moon are we seeing?

Simple astronomical telescope the objective lens has a focal length of 75 cm and that of a piece of 5cm of the lenses are 18 cm apart when will be final image of a distant object before

In the figure, polygon abcd is transformed to create polygon a′b′c′d′. this transformation is a by a factor of .