dwarf planet
noun
: a celestial body that orbits the sun and has a spherical shape but is not large enough to disturb other objects from its orbit
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The roughly 680-mile-wide (1,090 kilometers) dwarf planet would pass in front of the background star at an angle visible only to observers in northern Canada and other parts of the Arctic during daylight hours.
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Nola Taylor Tillman, Space.com, 10 Sep. 2025
Three planets have been found around the dwarf planet Proxima Centauri, by far the smallest and dimmest of the stellar threesome.
—Eric MacK, Forbes.com, 7 Aug. 2025
As for the second astrological transit, the transformational dwarf planet Pluto is squaring the needle Pluto, and also making a square.
—Lisa Stardust, People.com, 3 July 2025
It was renamed a dwarf planet in 2006 by the International Astronomical Union because of its size and that other planets may cross its orbit.
—Sara Novak, Discover Magazine, 23 June 2025
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Nola Taylor Tillman, Space.com, 10 Sep. 2025
Three planets have been found around the dwarf planet Proxima Centauri, by far the smallest and dimmest of the stellar threesome.
—Eric MacK, Forbes.com, 7 Aug. 2025
As for the second astrological transit, the transformational dwarf planet Pluto is squaring the needle Pluto, and also making a square.
—Lisa Stardust, People.com, 3 July 2025
It was renamed a dwarf planet in 2006 by the International Astronomical Union because of its size and that other planets may cross its orbit.
—Sara Novak, Discover Magazine, 23 June 2025
See All Example Sentences for dwarf planet
Cite this Entry
“Dwarf planet.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dwarf%20planet. Accessed 19 Sep. 2025.
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