1. Unit 6: Shoot for the Stars Theme 12: Explorers in Space http://hannahsworld.files.wordpress.com/2007/11/astronaut.jpg

2. challenge- a test of someone’s abilities Runners give themselves a challenge to run farther and faster. http://www.newsgd.com/specials/2008Paralympics/News/content/images/attachement/jpg/site26/20080910/0010dc53fa040a3175c108.jpg

3. pressure- the amount of force, or power, being used in a certain area Air pressure is the force of the air. http://www.scottsdalecc.edu/green/images/some_motorists_are_inflating_their_tires_with_nitrogen_instead_of_air_because_nitrogen_filled_tires_maintains_pressure_longer_and_may_improve_gas_mileag_1_.jpg

4. immense- something that is very big The size of the approaching hurricane is immense. http://web.arch.usyd.edu.au/~andrew/infodevice_2008/students/cyclone/Images/hurricane-katrina-category-5.jpg

5. occupation- the work that someone does regularly to earn a living A person’s occupation is his or her job. http://www.totaloccmed.com/images/Total-Occupation-Home_06.jpg

6. astronaut- someone who is trained to travel in space Mae Jemison was the first African American female astronaut to travel in space. http://image3.examiner.com/images/blog/EXID26131/images/jemison.jpg

7. avoid- to stay away from something You can avoid getting sunburned by applying sunscreen on your skin. http://www.fda.gov/ucm/groups/fdagov-public/documents/image/ucm050449.jpg

8. launch- to send an object into the air or into space Many space shuttles are launched from Kennedy Space Center in Florida. http://www.momi.ch/content/images/Besichtigung%20im%20Kennedy%20Space%20Center.jpg

9. process- a series of actions or steps taken to complete a task The process of baking a cake is fun and easy. http://images.inmagine.com/img/inspirestock/ispc067/ispc067062.jpg

10. atmosphere- the mixture of gases that surround a planet Meteorologists study Earth's atmosphere to predict weather conditions. http://www.google.com/imgres?imgurl=http://www.kidsgeo.com/images/earths-atmosphere.jpg&imgrefurl

11. astronomy- the science of the universe People who work in the field of astronomy study how different planets and objects move and appear in space. http://register.freeze.com/Images/dynamic_download/product_image/astronomy/astronomy_418x306.jpg