7 Satellites also help us explore space Vocabulary:satelliteAn object in space that orbits another object in space
8 Satellites made by people send pictures and other information back to Earth
9 The Hubble TelescopeOrbits EarthIt sends us pictures of stars 100 times clearer than we get from instruments on Earth
10 1889 – 1953 Born in Marshfield, Missouri Hubble has helped change our thoughts and perception of the universe in two important ways.
11 First, Hubble confirmed the existence of other galaxies other than the Milky Way, during a time when many people thought the Milky Way was the entire universe.
12 Secondly, with the help of other astronomers, he confirmed that the universe was expanding at a constant rate by developing a mathematical concept to back up this statement, now known as Hubble's Law.
13 Another way people explore space is to send astronauts in spacecraft VocabularyspacecraftA vehicle that can travel in space
14 Astronauts have been to the moon several times The first landing on the moon took place on July 20, 1969
15 Neil Armstrong was the first person to walk on the moon He and other astronauts took many photographs and collected rocks and soil
17 They left instruments on the moon to gather information
18 Astronauts have not traveled to other planets But some spacecraft have traveled far into space.
19 Voyager took pictures of Jupiter, Saturn, Uranus, and Neptune The Voyager space probes were sent into space in 1977 to study the most distant planetsVoyager took pictures of Jupiter, Saturn, Uranus, and Neptune
20 These pictures showed moons that people have never seen before They showed volcanoes, too
21 Voyager is now traveling beyond our solar system And has identified other solar systems beyond ours