There is one planet that still fascinates and teases scientists, mainly because it doesn’t have an atmosphere to obscure observation, yet it is not big enough for sufficiently accurate telescopic observation. The fact that it is also very close to the sun also makes it difficult for astronomers.
Why does one planet still tease scientists?
Select one:
a. Because it is so small.
b. Because it is too close to the sun.
c. Because it is difficult for space probes to get close to.
d. Because it has an atmosphere which obscures observation