To determine which planets are likely to be gas giants, we need to examine their orbital radii. Generally, gas giants have larger orbital radii compared to terrestrial planets.
Here are the given orbital radii for the planets:
- Planet W: 5.2 Astronomical Units (AU)
- Planet X: 0.72 AU
- Planet Y: 0.37 AU
- Planet Z: 19.1 AU
We will identify the planets that have orbital radii larger than 5.0 AU, which is a reasonable threshold to consider them as gas giants.
1. Planet W has an orbital radius of 5.2 AU. This is larger than 5.0 AU, so Planet W can be considered a gas giant.
2. Planet X has an orbital radius of 0.72 AU. This is smaller than 5.0 AU, so Planet X is not likely to be a gas giant.
3. Planet Y has an orbital radius of 0.37 AU. This is smaller than 5.0 AU, so Planet Y is not likely to be a gas giant.
4. Planet Z has an orbital radius of 19.1 AU. This is significantly larger than 5.0 AU, so Planet Z can be considered a gas giant.
Therefore, the planets likely to be gas giants are W and Z.
So, the correct answer is:
[tex]\[
W \text{ and } Z
\][/tex]
