Why is it so hard to see planets around other stars and so easy to see them around our own?

Planets only reflect light from light emitting source and so are much fainter than their host stars when viewed at large distances. Therefore, glare from the host stars often completely washes out the planetary light.

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas