The compound noun solar system is a common noun, a word for any solar system anywhere. A proper noun is the name of a solar system, for example Epsilon Eridani which is about 10.5 light years from earth.
The noun 'asteroid' is a common noun, a general word for any a small rocky body orbiting the sun.
A proper noun is the name of a specific person, place, or thing.
Examples of proper nouns for the common noun 'asteroid' are Asteroid Street in San Antonio TX or Asteroid Auto Parts in Calgary AB, Canada.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
Common
It is a proper noun, because it is the name of a specific thing.
proper
Proper noun
Yes, Neptune is a proper noun because it is the name of a specific planet in our solar system.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
Yes, "Jupiter" should be capitalized in a sentence as it is a proper noun referring to the planet in our solar system.
Common
It is a proper noun, because it is the name of a specific thing.
proper
The noun moon is a common noun because it is a word for any kind of moon anywhere.A proper noun is the name of a person, place, thing, or a title; for example:Moon Unit Zappa (real name), actressMoon Township, PABlue Moon Cafe, Sedona, AZ'Tell Me That You Love Me Junie Moon' (1970 movie), with Liza MinnelliMoon can be both a common and a proper noun. There are several moons (common noun) in our Solar System, and we refer to The Earth's natural satellite as The Moon (proper noun.)
Proper noun
it's a common noun. a proper noun would be Spider-Man.
Pencil proper or common noun
Proper noun or common noun
The noun cassette is a common noun.