Which country's constitution is the world's longest?
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Which type of electromagnetic radiation has the longest wavelength?
What is the process of waste water treatment is commonly known?
Who discovered Pluto?
Which is the coldest planet?
What is the name of the asteroid that causes Geminid meteor shower display around 15 December of every year?
In 2015, underground glaciers of frozen water were discovered on
Which of the following is the largest satellite of the Solar System?