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Across 4. A large planet of relatively low density consisting predominantly of hydrogen and helium, such as Jupiter, Saturn, Uranus, or Neptune 6. What is at the Center of the Milky Way? 9. A black dwarf is a hypothetical stellar remnant, created when a white dwarf becomes sufficiently cool to no longer emit significant heat or light 11. Distance that light travels in one year 12. a cooler darker spot appearing periodically on the sun's photosphere; associated with a strong magnetic field 13. A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction

Down 1. A small very dense star that is typically the size of a planet 2. A group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure 3. A small rocky body orbiting the sun. Large numbers of these, ranging in size from nearly 600 miles (1,000 km) across (Ceres) to dust particles 5. A region of space having a gravitational field so intense that no matter or radiation can escape 7. A cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter 8. A very large star of high luminosity and low surface temperature 10. A natural electrical phenomenon characterized by the appearance of streamers of reddish or greenish light in the sky, usually near the northern or southern magnetic pole