a. Asteroids Asteroids, also called minor planets or planetoids, are a class of astronomical objects. The asteroid is a small celestial body that drift in the solar system in orbit around the sun. Between the orbits of mars and Jupiter.
b. Black Hole black hole is an object with a gravitational field so powerful that even electromagnetic radiation(such as light) cannot escape its pull.
c. Aurora The aurora is a bright glow observed in the night sky, usually in the polar zone. For this reason some scientists call it a "polar aurora" .
d. Sedimentary Rock A Sedimentary rock is one of the three main rock groups (along with igneous and metamorphic rocks) . Sedimentary rocks cover 75% of the Earth's land area. Sedimentary rocks include common types such as chalk, limestone, sandstone and shale.
e. Epiphytes An epiphyte is an organism that grows upon or attached to a living plant. Epiphytic plants are sometimes called "air plants" because they do not root in soil.
f. Ionosphere The ionosphere is the part of the atmosphere that is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere.