QQuestionAstronomy
QuestionAstronomy
The Andromeda Galaxy is located 2.5 million light-years away. How long does light take to travel from there to reach us?
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Answer
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Step 1:I'll solve this problem step by step, following the specified LaTeX formatting guidelines:
Step 2:: Identify the Given Information
- Distance to Andromeda Galaxy: $$2.5 \times 10^{6}$$ light-years
- We need to calculate the travel time of light
Step 3:: Understand the Definition of a Light-Year
1 \text{ light-year} = \text{distance light travels in } 1 \text{ year}
A light-year is the distance light travels in one year. By definition, this means:
Step 4:: Calculate the Travel Time
\text{Travel Time} = 2.5 \times 10^{6} \text{ years}
Since the distance is exactly the number of light-years away, the travel time is numerically equal to the distance:
Final Answer
Key Insight: A light-year is a unit of distance, not time, but in this case, the numerical value directly represents the travel time because the distance is expressed in light-years.
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