2. Chapter: Exploring Space Table of Contents Section 3: Current and Future Section 1: Radiation From Space Section 2: Early Space Missions Space Missions

22. 1 Section Check Question 1 Which type of telescope uses convex lenses to form images? A. Keck B. radio C. reflecting D. refracting NC: 5.04

23. 1 Answer Section Check The answer is D. Refracting telescopes use convex lenses; reflecting telescopes use concave mirrors. NC: 5.04

24. 1 Question 2 Section Check Answer What is meant by the term “active optics”? Active optics uses computers to correct for changes in temperature and distortions, improving telescope images. NC: 5.04

25. 1 Question 3 Section Check Radio telescopes study waves with wavelengths of _______. A. 10-15 m B. 10-10 m C. 10-5 m D. 105 m NC: 5.04

26. 1 Answer Section Check The answer is D. Radio waves are long- wavelength electromagnetic waves. Radio telescopes use large, concave dishes to reflect radio waves to a receiver. NC: 5.04

49. 2 Section Check Question 1 Which cannot be shut down after it is ignited? A. Galileo B. Liquid-propellant rocket C. Solid-propellant rocket D. Voyager NC: 2.03, 5.04

50. 2 Answer Section Check The answer is C. Galileo and Voyager are examples of liquid-propellant rockets, which can be shut down after they are ignited. NC: 2.03, 5.04

51. 2 Question 2 Section Check Any object that revolves around another object is a(n) _______. A. orbit B. probe C. rocket D. satellite NC: 5.04

52. 2 Answer Section Check The answer is D. The curved path of a satellite is its orbit. NC: 5.04

53. 2 Question 3 Section Check The goal of Project Mercury was to ________. A. design a reusable spacecraft B. land on the Moon C. orbit a piloted spacecraft around Earth D. repair the space station Mir NC: 5.04

54. 2 Answer Section Check The answer is C. Project Mercury was the first in a series of missions leading up to the first Moon landing. In 1962, Mercury astronaut John Glenn became the first U.S. citizen to orbit Earth. NC: 5.04

82. 3 Section Check Question 1 Which was a space station? A . Galileo B . Pioneer 10 C . Skylab D . Sputnik I NC: 5.04

83. 3 Answer Section Check The answer is C. The U.S. launched Skylab in 1973 and used it to perform experiments and collect data on the effects on humans of living in space. NC: 5.04

85. 3 Answer Section Check The answer is D. This probe is expected to reach its goal in 2004, and will explore Saturn and the surrounding areas for four years. NC: 5.04

86. 3 Question 3 Section Check The remote-controlled robot that was used to collect data about the surface of Mars was ________. A. Odyssey B. Pathfinder C. Sojourner D. Surveyor NC: 5.04

87. 3 Answer Section Check The answer is C. Sojourner was the remote- controlled robot rover used on Mars. NC: 5.04

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89. End of Chapter Summary File