Two or more stars that orbit each other and appear as a single star from Earth are known as binary stars. Constellations are patterns of bright stars as viewed from Earth, while asterisms are smaller patterns that are part of larger constellations. The asteroid belt lies between the orbits of Mars and Jupiter and contains thousands of chunks of rock known as asteroids.

1. Binary stars

2. Binary starsWhen two relatively close stars revolve around each other, often appearing as single stars because they are so far away from the Earth.

3. Binary starsWhen two relatively close stars revolve around each other, often appearing as single stars because they are so far away from the Earth.

4. Asterism

5. Asterismstars that form patterns but are generally smaller than or part of a constellation. The Big Dipper is an asterism and forms part of the constellation Ursa Major.

6. Asterismstars that form patterns but are generally smaller than or part of a constellation. The Big Dipper is an asterism and forms part of the constellation Ursa Major.

7. Constellations

8. ConstellationsBright stars grouped according to the patterns they make in the sky.

9. ConstellationsBright stars grouped according to the patterns they make in the sky.

10. Asteroidbelt

11. AsteroidbeltThe area between the inner and outer planets that is filled with asteroids.

12. AsteroidbeltThe area between the inner and outer planets that is filled with asteroids.

13. Asteroids

14. Asteroidschunks of rock that vary in size from very large (appr. 1030 km in diameter) to quite small. They orbit the sun between the orbits of Mars and Jupiter. About 3000 asteroids have been discovered.

15. Asteroidschunks of rock that vary in size from very large (appr. 1030 km in diameter) to quite small. They orbit the sun between the orbits of Mars and Jupiter. About 3000 asteroids have been discovered.

16. astronomy

17. astronomythe study of the Universe and all of the bodies that appear in the skies

18. astronomythe study of the Universe and all of the bodies that appear in the skies

19. Axis

20. Axisa straight line that an object or body rotates, or seems to rotate around

21. Axisa straight line that an object or body rotates, or seems to rotate around

22. Black hole

23. Black holean intense gravitational field created when a star runs out of fuel and collapses. Nothing, not even light can escape its pull.

24. Black holean intense gravitational field created when a star runs out of fuel and collapses. Nothing, not even light can escape its pull.

25. Comet

26. Cometa large ball of ice, dust, rock and gas that orbits the Sun, circling the dark edges of the Solar System

27. Cometa large ball of ice, dust, rock and gas that orbits the Sun, circling the dark edges of the Solar System

28. Crater

29. CraterA hole created on the surface of an object or body, made by falling meteorites or by erupting volcanoes.

30. CraterA hole created on the surface of an object or body, made by falling meteorites or by erupting volcanoes.

31. EMIT

32. EMITto send or give out

33. EMITto send or give out

34. Galaxy

35. GalaxyA spiral island of stars in space. Our galaxy is called the Milky Way.

36. GalaxyA spiral island of stars in space. Our galaxy is called the Milky Way.

37. Gibbous

38. GibbousA phase in the moon’s cycle when more than half of the moon, but not the entire face of the Moon, is illuminated.

39. GibbousA phase in the moon’s cycle when more than half of the moon, but not the entire face of the Moon, is illuminated.

40. gravity

41. gravitya force that attracts and holds the universe together. It gives objects weight

42. gravitya force that attracts and holds the universe together. It gives objects weight

43. Inner planets

44. Inner planetsThe four hard rocky planets – Mercury, Venus, Earth, Mars – closest to the Sun

45. Inner planetsThe four hard rocky planets – Mercury, Venus, Earth, Mars – closest to the Sun

46. Light year

47. Light yearthe distance light travels in a year. This unit is used to measure distances in space. One light year is about 9.5 trillion km

48. Light yearthe distance light travels in a year. This unit is used to measure distances in space. One light year is about 9.5 trillion km

49. Lunar Eclipse

50. Lunar Eclipsewhen the moon moves into the Earth’s shadow, preventing sunlight from falling onto the moon’s surface.

51. Lunar Eclipsewhen the moon moves into the Earth’s shadow, preventing sunlight from falling onto the moon’s surface.

52. Blue Moon

53. Blue MoonThe second full moon in the same calendar month.

54. Blue MoonThe second full moon in the same calendar month.