Which is a plan for the future of space exploration? build a space station
astronauts visiting Mars
astronauts orbiting Earth
build a space observatory

its b nasa and every other space obsessed place has done all of that

B-Astronuts  visting mars.

Explanation:

Just took the test.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.