Answer:
The Earth is a very bright object when viewed with a light telescope. The light from the sun reflects off of the Earth's surface and this makes it very difficult to see anything else.
Step-by-step explanation:
The brightness of the Earth makes it difficult for an alien to view it with a light telescope. The light from the sun reflects off of the Earth's surface and this makes it very difficult to see anything else. The light from the sun can also cause the Earth's atmosphere to glow, making it even harder to see anything else.