Across
- 3. The method used to identify elements by their properties is _______________.
- 7. The Moon is an example of a ________ satellite.
- 8. Galileo's observation of the moons of __________ challenged the geocentric model by showing that celestial bodies do not orbit Earth.
- 10. The galaxy that contains our solar system is called the ________.
- 13. The telescope that was launched in 1990 and provided clear images of deep space is the ____________.
- 15. The heliocentric model developed by Copernicus states that the _______ is at the center of the solar system and planets, including Earth, orbit around it.
- 16. The most powerful space telescope, launched in 2021, is the _________ telescope.
- 20. The type of telescope used to view radiation beyond the visible spectrum is the _________ telescope.
- 21. As the distance from an object increases, the amount of light that reaches us _____________.
- 24. A modern _________ is defined as one of 88 regions of the sky.
- 25. _________ is the only planet in the solar system known to support life.
- 27. Eratosthenes calculated the circumference of Earth by measuring the angle of the Sun's rays at ____ locations.
- 31. The astronomer who built on Brahe's work to create laws of planetary motion was _________.
- 33. The outermost layer of Earth's atmosphere is the _________.
- 35. The two types of visible light telescopes are reflecting and __________ telescopes.
- 36. The greater the distance between two objects, the ___________ the gravitational force.
- 37. For an object orbiting Earth, perigee is the closest point to _________.
- 38. The phases of the __________ occur due to its changing position relative to the Earth and Sun.
- 39. The temperature at the surface of the Sun is approximately 5,500 degrees _________.
- 40. The thinnest layer of Earth is the _________.
- 41. The three types of rock in Earth's crust are _______, sedimentary, and metamorphic.
Down
- 1. On the cosmic calendar, the most recent event was the extinction of ___________.
- 2. The most abundant component of Earth's atmosphere is __________.
- 4. The phenomenon of the Sun’s atmosphere releasing large amounts of energy in the form of light and particles is called a _____________.
- 5. The force that keeps planets in orbit around the Sun is called _________.
- 6. Specific wavelengths of light emitted or absorbed by elements are called ___________________.
- 9. It takes light ________ minutes to travel from the Sun to Earth.
- 11. space: The space between stars that contains gas and dust, blocking light, is called _________.
- 12. A Greek astronomer found Earth's size by using the Sun's ______ at different locations.
- 14. The scientific method is a process that involves a cycle of ___________, hypothesis, experiment, and conclusion.
- 17. The "middle" sphere of the atmosphere is the ________.
- 18. A _________ is equivalent to 9.46 × 10¹² kilometers.
- 19. _________ was the first person to observe the moons of Jupiter, proving that not everything orbits around Earth.
- 22. Light exhibits the properties of both a ______ and a particle.
- 23. The Earth's axis is tilted by 23.5 degrees, causing the ____________.
- 26. The Earth completes one full rotation on its axis in _________ hours.
- 28. The term for the point in a planet's orbit when it is closest to the Sun is ____________.
- 29. The astronomer who collected 20 years of data on planetary position was __________.
- 30. ________ is the study of space and celestial objects.
- 32. Infrared telescopes are used to detect ________ emissions from celestial objects.
- 34. The chemical element that makes up most of the Sun’s mass is ___________.