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Oort cloud

The ________, which is thought to be the source for long- period comets, may also exist at a distance roughly a thousand times further than the heliosphere.

Kuiper

Astronomers generally accept about nine objects as dwarf planets: the asteroid Ceres, the ________- belt objects Pluto, Orcus, Haumea, Quaoar and Makemake, the scattered- disk objects Gonggong and Eris, and Sedna.

Solar System

The ________ is located 26, 000 light- years from the center of the Milky Way galaxy in the Orion Arm, which contains most of the visible stars in the night sky.

asteroid belt

The ________, which lies between the orbits of Mars and Jupiter, contains objects composed of rock, metal and ice.

Solar System c

The ________] is the gravitationally bound system of the Sun and the objects that orbit it.

solar wind

The ________, a stream of charged particles flowing outwards from the Sun, creates a bubble- like region of interplanetary medium in the interstellar medium known as the heliosphere.

interstellar medium

The heliopause is the point at which pressure from the solar wind is equal to the opposing pressure of the ________; it extends out to the edge of the scattered disc.

Astronomers generally accept about nine objects as dwarf planets

the asteroid Ceres, the Kuiper-belt objects Pluto, Orcus, Haumea, Quaoar and Makemake, the scattered-disk objects Gonggong and Eris, and Sedna