what is meant by the planet ?
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planet is a heavenly body which revolves around the sun.
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The International Astronomical Union defined a planet as an object that:
orbits the sun
has sufficient mass to be round, or nearly round
is not a satellite (moon) of another object
has removed debris and small objects from the area around its orbit
The IAU also created a newer classification, "dwarf planet," which is an object that meets planetary criteria except that it has not cleared debris from its orbital neighborhood. This definition meant that Pluto — considered a planet at the time — was demoted and reclassified as a dwarf planet.
But not all scientists agree with this classification, particularly after the New Horizons spacecraft flew by Pluto in 2015. The spacecraft revealed a complex world full of geological change. This included mountains reaching as high as 11,000 feet (3,500 meters), a heart-shaped region nicknamed Tombaugh Regio that contains methane ice and other substance, and weird ice-ridged terrain that looks like snakeskin, among many other features Since then, members of the New Horizons team have made scientific presentations arguing Pluto is indeed a planet. The new scientific findings continue to amaze the public, Alan Stern said in 2018.
"I think my two biggest surprises were first, just how utterly amazing Pluto turned out to be — how many different kinds of features were on the surface and even in the atmosphere," Stern said in a NASA podcast interview. "There was something for everyone. And the second amazing finding was how many members of the public really wanted to participate in it and just be a part of this exploration. We expected it would be a big response, but it was much bigger than we thought."
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YOUR ANSWER IS HERE
The International Astronomical Union defined a planet as an object that:
orbits the sun
has sufficient mass to be round, or nearly round
is not a satellite (moon) of another object
has removed debris and small objects from the area around its orbit
The IAU also created a newer classification, "dwarf planet," which is an object that meets planetary criteria except that it has not cleared debris from its orbital neighborhood. This definition meant that Pluto — considered a planet at the time — was demoted and reclassified as a dwarf planet.
But not all scientists agree with this classification, particularly after the New Horizons spacecraft flew by Pluto in 2015. The spacecraft revealed a complex world full of geological change. This included mountains reaching as high as 11,000 feet (3,500 meters), a heart-shaped region nicknamed Tombaugh Regio that contains methane ice and other substance, and weird ice-ridged terrain that looks like snakeskin, among many other features Since then, members of the New Horizons team have made scientific presentations arguing Pluto is indeed a planet. The new scientific findings continue to amaze the public, Alan Stern said in 2018.
"I think my two biggest surprises were first, just how utterly amazing Pluto turned out to be — how many different kinds of features were on the surface and even in the atmosphere," Stern said in a NASA podcast interview. "There was something for everyone. And the second amazing finding was how many members of the public really wanted to participate in it and just be a part of this exploration. We expected it would be a big response, but it was much bigger than we thought."
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