| eclipse | | Nuclear fusion occurs in the ______, or center, of the sun. |
| Mercury | | Planet with 49 total moons and a Great Red Spot that is a storm more than 400 years old |
| Galileo | | "Sun ______" are cooler, dark spots on the sun |
| Belt | | The time require for Earth to rotate once on its axis is one |
| corona | | Between the orbits of Mars and Jupiter is a region of rocky objects called the ______. |
| sun | | The Earth is tilted on its _________ at 23.5 degrees |
| day | | The atmospheres of the gas giants are composed mainly of the element ______. |
| core | | Magnetic storms are a result of an increase in solar wind caused by explosions called ______. |
| Year | | The planets that are closer to the sun than Earth are Venus and _____. |
| Mars | | Most ancient astronomers thought that all celestial objects revolved around _________. |
| Earth | | The tendency for an object in motion to continue in a straight line is called _________. |
| gravity | | The "Asteroid ______" is located between Mars and Jupiter |
| axis | | The force that pulls the moon toward Earth is called _______. |
| prominence | | The middle layer of the sun's atmosphere is the ________. |
| asteroid belt | | The only outer planet with a solid surface is ______. |
| spots | | The study of all physical objects beyond Earth |
| planet | | Types of planets that are small, dense, and have rocky surfaces |
| hydrogen | | Occurs when the shadow of one celestial body falls on another |
| solar | | The first person to use a telescope to observe celestial bodies |
| satellite | | Each planet and its moons form a small system. These systems combine to form the larger ______ system. |
| solar flares | | Called the "Red Planet" |
| nuclear fusion | | The sun's ______, which looks like a halo, can usually be seen only during an eclipse. |
| inertia | | The sun's energy comes from the process of __________, in which hydrogen atoms form helium. |
| Saturn | | A natural or artificial body that revolves around larger bodies like planets |
| terrestrial | | A loop of gas that links different parts of sunspot regions is a ________. |
| astronomy | | Planet that is famous for its spectacular rings |
| chromosphere | | A celestial body that is in orbit around the sun |
| Pluto | | The time required for the Earth to orbit the sun is one |
| Jupiter | | The closest star to Earth |
