Question

Tom can see the Sun because it is a light source. It gives out its own light. Neptune and Pluto are not light sources but Tom can see them when he looks through his telescope. Explain why Tom can see Neptune and Pluto even though they are not a light source

Answer 1

due to reflection of light for ex moon is also not a luminous thing but can be seen because moon reflect the light of the sun same as Neptune and Pluto do

Answer 2

Tom can see the Sun because it is a light source. It gives out its own light. Neptune and Pluto generally are not the light sources but Tom could see them easily when he looked through the telescope.

Due to the reflection of light he could see them. The moon is also not a luminous thing but can easily be seen as it reflects the sun light same as the Pluto and Neptune.