People from different countries have set the goal of working together to __________ human space travel within the solar system
expand
People can reach this goal by sending probes to the _______and _________
sun and moon
Data from probes sent near the _______can hep scientists understand the hazards of solar radiation
Sun
by using the information from _______probes,scientist hope to figure out a good place to set up future outposts n the moon
Lunar
The inner planets are 4 rocky planets closets to the Sun, in order they are
Mercury , venus , earth and mars
Probes to these planets help scientists learn how these planets_________, what geologic__________ are acting on the and whether any of these planets can support_________
formed, forces, life
The outer planets are the four larger planets farthest from the sun in order they are
Jupiter, Saturn, Uranus, and neptune
_________ was once considered an outer planet, but now it is considered an icy dwarf planet
Pluto
Missions to the outer planets take ________time and are difficult because these planets are so _______from earth
Long, far
Mission to see of the outer planets and to Pluto have used a technique called___________
Gravity assist
Early destinations for human space travel are the Moon and _________
Mars
Future visits to the moon will not be __________ as in the past
brief
The mission will be to build a lunar _________ where people can ________ and do research in the harsh lunar environment
Spacecraft, live
Nasa plans to send several more _____to mars to explore sites that might have resources that can support life
Probes
the study of life in the universe , including life on earth and the possibility of extra terrestrial life is called
Astrobiology
Using astro biology, scientists are searching for environments in space other than Earth where humans and other than earth where humans and other earth life might be able to ___________
survive
Life exists in many extreme environments on earth as long as they have liquid _________, ______________, and _________________
Liquid water, organic molecules, and source of energy
Evidence from Space probes suggest that several planets and many moons have ___________or ice on our near their surfaces
Water vapor
Studyng other planets helps scientists understand how the sun and other planets affect __________, how earth is formed, and how earth supports_______________
earth, life
Scientists are looking for other earthlike planets in the universe to try to figure out of extraterrestrial life might exist of if life on earth is likely to be __________
unique
Most of the 300 planets scientist have discovered so far outside the solar system are larger than earth and probably could not support ______water or ___________
liquid, life
NASA has launched a space -________ called Kepler to study an area of the sky containing about 100,00_______to look for earth like planets orbiting other stars
telescope, stars
NASA and other space agencies around the world have satellites that orbit Earth and help scientists understand Earths______and ___________
climate and weather
A major goal to expand human space travel is
within the solar system
Probes will be sent to the sun to understadn
the hazards of solar radiation
Probes will be sent to the moon to help plan
the best location for a future lunar outpost
Understanding the geologic forces on the inner planets help scientists learn
whether they can support life
International efforts involving many countries will send missions to
the distant outer planets
Gravity assists can be used to shorten
the time it takes space craft to reach the outer edges of the solar system
The first destination for human space travel is
the moon and mars
Building a lunar outpost will
enable scientists to do research on the moon
searching for resources on mars that can support life will
prepare for a visit in several more decades
investigating the conditions for life on earth helps
predict the chances of life elsewhere in the solar system
Locating water vapor or ice on planets or moons might
suggest the possibility of extraterrestrial life