An astronaut must journey to a distant planet, which is 211 light-years from earth. what speed will be necessary if the astronaut wishes to age only 15 years during the trip? (give your answer accurater to five decimal places.) hint: the astronaut will be traveling at very close to the speed of light. therefore, approximate the dilated trip time at to be 211 years

Explanation:

We know that the equation for time dilation will be:

where Δt its the time difference measured from Earth, and Δt' is the time difference measured by the astronaut.

Lets work a little the equation

So, we got our equation. Knowing that Δt=211 years and Δt'=15 years

then

0.55x745.7j and a calculator

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.