A vast doughnut-shaped region located between Mars and Jupiter containing millions of rocky debris items. Total mass is estimated at just 4% of Earth's Moon, with Ceres comprising one-third of the total.

A unique M-type asteroid thought to be the exposed nickel-iron core of an ancient protoplanet destroyed by violent collisions. Its metal wealth is estimated at a mind-boggling $10,000 quadrillion.

The most famous periodic comet, returning to Earth's skies every 75–76 years. When approaching the Sun, its volatile ice sublimates, producing a glowing coma and ion tail millions of kilometers long.

Asteroids whose orbits bring them close to Earth's orbit (within 1.3 AU). Space agencies track over 30,000 NEOs (like Bennu and Apophis) to monitor potential collision risks and test planetary defense (DART mission).

A theoretical giant spherical shell of icy body debris encapsulating our Solar System between 2,000 and 100,000 AU from the Sun. It is the reservoir from which long-period comets originate.