Watch and listen to this video about the Universe. You will have to understand these words to answer the questions and learn some interesting facts about astronomy. Use a dictionary and make sure you know their meanings:
mostly, stuck, rocky, universe, planet, view, Earth, metallic core, teem, Sun, energy, surface temperature, rotate, tonnes, stationary, spinning, fly through space, vast, collection, orbit, Milky Way, Solar System, helium, hydrogen,
Outer Arm, oxygen-based, convert, miles per second, billion, galaxies, make up, visible, star, silicon, Mercury, Neptune, circle, estimated, planetary system, centre.
Outer ArmOne of the two major spiral arms of our own Milky Way Galaxy, the other being the Sagittarius Arm. The Outer Arm emerges from the Galactic Nucleus on the opposite side to our Solar System, and arcs around the Galaxy in an almost complete semi-circle. It comes to an end about 20,000 light years from the Sun, in the direction of the constellation Cygnus.