Comet Halley orbits the sun with a period of 76 years and, in 1986,had a distance of closestapproach to the Sun, its perihelion distance `R_p`,of `8.9 xx 10^10m`.Table 13-3 shows that this is between the orbits of Mercury and Venus.
(a) What is the comet's farthest distance from the Sun, which is called its aphelion distance`R_a`?

Explanation

To find the farthest distance from the Sun (aphelion distance \( R_a \)) for Comet Halley, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the relationship between perihelion and aphelion distances**:
The relationship between the perihelion distance (\( R_p \)) and aphelion distance (\( R_a \)) is given by:
\[
R_a + R_p = 2a
...