German mathematician and astronomer who made accurate measurements of stellar distances and who predicted the existence on an 8th planet (1784-1846)
a small reddish planet that is the 4th from the sun and is periodically visible to the naked eye
the 8th planet from the sun is the most remote of the gas giants
the 6th planet from the sun n
the 7th planet from the sun has a blue-green color and many satellites
at a high plane
在很高水平上
match plane
合榫刨
smooth plane
细刨
tooth plane
[医] 牙平[剖]面
