Terms : Hide Images
| 1207486542 | The plane of Earth's orbit around the Sun. | Ecliptic Plane | 0 | |
| 1207486543 | The amount by which a planet's axis is tilted with respect to a line perpendicular to the ecliptic plane. | Axis Tilt (Of a planet in our solar system) | 1 | |
| 1207486544 | Another term for Solar System | Star System | 2 | |
| 1207486545 | The portion of the MIlky Way Galaxy that is located relatively close (Within a few hundred to a couple thousand light-years) to our Sun. | Local Solar Neighborhood | 3 | |
| 1207486546 | Generally considered to encompass the region of our solar system beginning at about the orbit of Jupiter. | Outer Solar System | 4 | |
| 1207486547 | Spacecraft that go into orbit of another world for long-term study. | Orbiters (of other worlds) | 5 | |
| 1207486548 | The name given to the even though to mark the birth of the universe. | Big Bang | 6 | |
| 1207486549 | The group of about 40 galaxies to which the Milky Way Galaxy belongs. | Local Group | 7 | |
| 1207486550 | The orbital motion of one object around another. | Revolution | 8 | |
| 1207486551 | Used both as the name of our Galaxy and refer to the band of light we see in the sky when we look into the plane of the Milky Way Galaxy | Milky Way | 9 | |
| 1207486552 | A moderately large object that orbits a star and shines primarily by reflecting light from its star. | Planet | 10 | |
| 1207486553 | Term for cluster of stars | Star Cluster | 11 | |
| 1207486554 | A huge collection of anywhere from a few hundred million to more than a trillion stars, all bound together by gravity. | Galaxy | 12 | |
| 1207486555 | The idea that space between galaxies or clusters of galaxies is growing with time. | Expansion (of the universe) | 13 | |
| 1207486556 | An object that orbits the Sun and is massive enough for its gravity to have made it nearly round in shape but that does not qualify as the official planet because it has not cleared its orbital neighborhood. | Dwarf Planet | 14 | |
| 1207486557 | Another term for cluster of galaxies | Galaxy Cluster | 15 | |
| 1207486558 | The distance that light can travel in 1 year, which is 9.46 trillion km. | Light-year (ly) | 16 | |
| 1207486559 | Any object orbiting another object | Satelite | 17 | |
| 1207486560 | The supercluster of galaxies to which the Local Group belongs | Local Supercluster | 18 | |
| 1207486561 | A large, glowing ball of gas that generates energy through nuclear fusion in its core. | Star | 19 | |
| 1207486562 | A star (sometimes more than one star) and all objects that orbit it | Solar System (or Star System) | 20 | |
| 1207486563 | The path followed by a celestial body because of gravity; an orbit may be bound (elliptical) or unbound (parabolic or hyperbolic) | Orbit | 21 | |
| 1207486564 | The average distance (semimajor axis) of Earth from the Sun, which is about 150million km. | Astronomical Unit (AU) | 22 | |
| 1207486565 | An alternative name for the universe | Cosmos | 23 | |
| 1207486566 | The portion of the entire universe that, at least in principle, can be seen from Earth. | Observable Universe | 24 | |
| 1207486567 | The sum total of all matter and energy | Universe | 25 | |
| 1207486568 | An asteroid, comet, or other object that orbits a star but is too small to qualify as a planet or dwarf planet. | Small Solar System Body | 26 | |
| 1207486569 | A graph that plots rotational (or orbital) velocity against distance from the center for any object or set of objects. | Rotation Curve | 27 | |
| 1207486570 | Another name for elliptical galaxy | Spheroidal Galaxy | 28 | |
| 1207486571 | The nearest large spiral galaxy to the Milky Way | Andromeda Galaxy (M31; the Great Galaxy in Andromeda) | 29 | |
| 1207486572 | A relatively small and rocky object that orbits a star | Asteroids | 30 |
