Astronaut Sarah Leaves Earth in a Spaceship at a Speed

question 90

Multiple Choice

Astronaut Sarah leaves Earth in a spaceship at a speed of 0.280c relative to Earth.Sarah's destination is a star system 12.5 light-years away (one light-year is the distance light travels in one year) .According to Sarah,how far did she travel during the trip?

• A)13.0 light-years
• B)12.5 light-years
• C)12.0 light-years
• D)11.5 light-years
• E)11.0 light-years

---

Definitions:

Lithosphere

The rigid outer layer of the Earth, consisting of the crust and the uppermost part of the mantle, directly involved in plate tectonics and continental drift.

Asthenosphere

A region of the upper mantle of the Earth, below the lithosphere, where rocks are relatively soft and can flow slowly.

Oceanic Fracture Zone

Crack or step in elevation of the seafloor that formed as a transform fault along a mid-ocean ridge but is no longer a plate boundary.

Mantle

The thick layer of rock between the Earth's crust and core, constituting most of the Earth's volume and involved in tectonic processes.