The spiral galaxy in the Andromeda constellation is about 2 * 1019 km away from us. How many light-years is this?
1. 3.48837 * 106 c.
2. 1.62791 * 106 c.
3. 7.39958 * 105 c.
4. 1.08668 * 107 c.
5. 2.11416 * 106 c.
6. 5.09514 * 106 c.
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