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a. if a spacecraft was parked on venus and needed to make a flight to jupiter, how far would it need to travel? show your work and provide your answer in scientific notation.

b. mercury, venus, and earth are the three planets closest to the sun. would their combined distance from the sun be greater or less than the distance from the sun to neptune? show your work and justify your answer.

c. if earth was 10 times farther away from the sun than it is now, which planet would it be closest to? compare earth's new distance to that planet. how far apart would they be in standard notation? how far apart in scientific notation? show your work.

d. the space shuttle travels at about 28,000 km per hour. using that information, estimate how many hours it will take the shuttle to reach saturn from earth. show your work. convert your answer into scientific notation if necessary.