The first hint to crack the puzzle "Observatory from which Pluto was first spotted" is:

It is a word which contains 6 letters

The second hint to crack the puzzle "Observatory from which Pluto was first spotted" is:

It starts with letter l

The third hint to crack the puzzle "Observatory from which Pluto was first spotted" is:

It ends with letter l

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The answer for the puzzle "Observatory from which Pluto was first spotted" is: