Across
- 2. neutron stars with super powerful magnetic fields. Neutron stars are the leftover cores of stars that were massive enough to go supernova when they died, but not massive enough to form a black hole.
- 4. large objects made of dust and ice that orbit the Sun. Best known for their long, streaming tails, these ancient objects are leftovers from the formation of the solar system 4.6 billion years ago.
- 5. dazzling displays of colored light that sometimes appear in the night sky. They occur in Earth's far northern and far southern regions. In the Northern Hemisphere such a display is known as aurora borealis, or the northern lights.
- 7. either of the two times each year about March 21 and September 23 when the sun appears overhead at the equator and day and night are everywhere of equal length.
- 9. a group of stars
Down
- 1. A cloud of gas and dust that occurs in the space between the stars is known as a nebula (plural, nebulae). A nebula is thus made up of the interstellar medium. Some nebulae give birth to new stars, and dying stars expel nebulae.
- 3. small, rocky bodies that orbit, or travel around, the sun. They are also called minor planets or planetoids. In general, they are materials left over from when the planets formed. They are also created when other bodies in space collide and break apart.
- 6. Small chunks of rock that travel through space
- 8. a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity.