It's described as unique because there's nothing else like it. Why that is, science cannot tell, it's just an observed fact. One unique thing about Mercury is its huge range of surface temperatures. Another unique thing is its (almost) total lack of an atmosphere.
Mercury rotates very slow. Its day equals 59 of our days. As a matter of fact, it's day is longer than its year.
no
Mercury is the only metal that is liquid at "room" temperature.
Mercury is a liquid metal - a strange property.
mey
Mercury thermometers are based on the fact that materials (in this case, the liquid mercury) expand when heated.Mercury thermometers are based on the fact that materials (in this case, the liquid mercury) expand when heated.Mercury thermometers are based on the fact that materials (in this case, the liquid mercury) expand when heated.Mercury thermometers are based on the fact that materials (in this case, the liquid mercury) expand when heated.
It is toxic.
what is unique about the astronomical body of planet Mercury and why is it important in the universe?When was the planet Mercury discovered?
Mercury is a metal which is liquid at room temperature.
You can only see Mercury at sunrise and sunset.
It is a unique sport