long-period comets come from Oort cloud; their orbits suggest that the cloud is a spherical shell close to a light-year across, bisected by a doughnut; the rest of the solar system lies in the doughnut hole
The Oort Cloud is the massive spherical cloud that encases our entire Solar System. It is thought to extend from AU (an AU is equal to the distance from the Sun to the Earth), out to about AU, which is nearly a light year. It& composed
Tycho Central Peak and its Boulder In this image taken by the Narrow Angle Camera aboard the Lunar Reconnaissance Orbiter (LRO) you can see the central peak of the Tycho crater on our Moon. It rises more than meters feet) above the crater floor.