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How long is 4 kilometers?

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It's about 2,500 times as tall as Danny DeVito
In other words, the height of Danny DeVito is 0.00037 times 4 kilometers.
(a.k.a. Daniel Michael DeVito, Jr.) (1944-) (actor)
Danny DeVito, best known for his role as Louie De Palma in the 1978-83 television series Taxi, is 0.0015 kilometers tall. After graduating from high school, DeVito became a licensed cosmetician and it was out of interest in cosmetology that he first enrolled at the American Academy of Dramatic Arts and later began to study acting.
It's about 3,000 times as tall as Gary Coleman
In other words, 4 kilometers is 2,900 times the height of Gary Coleman, and the height of Gary Coleman is 0.00034 times that amount.
(a.k.a. Gary Wayne Coleman) (1978-2009) (actor)
Gary Coleman, most famous for his role as Arnold Jackson on the sitcom Diff'rent Strokes was 0.0014 kilometers tall. His small stature was a result of a congenital kidney disease. Coleman worked as a security guard since following his career as an actor.
It's about 3,000 times as tall as Matt Roloff
In other words, 4 kilometers is 3,100 times the height of Matt Roloff, and the height of Matt Roloff is 0.00032 times that amount.
(1961-) (actor and reality television star)
Matt Roloff, most famous for his role on the reality television show Little People, Big World, is an LP with a height of 0.0013 kilometers. In 1985, Roloff stared as an Ewok — one of the small, woodland creatures from the Star Wars franchise — in the movie Ewoks: The Battle for Endor
It's about one-three-thousandth as long as The Diameter of Earth
In other words, 4 kilometers is 0.00031357121 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 3,189.0683 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has a diameter of approximately 12,756.2730 kilometers at the Equator. The first complete view of Earth's diameter was in a photograph taken from a V-2 rocket launched in 1946 by the United States Army, which reached an altitude of 104.607360 kilometers.
It's about 3,500 times as tall as Hervé Villechaize
In other words, the height of Hervé Villechaize is 0.0003 times 4 kilometers.
(a.k.a. Hervé Jean-Pierre Villechaize) (1943-1993) (actor)
Hervé Villechaize, most famous for his role as Tattoo on the 1978-84 television series Fantasy Island, was an LP with a height of 0.0012 kilometers. Villechaize's form of dwarfism, spondyloepiphyseal dysplasia-brachydactyly and distinctive speech (SED-BDS), is also known as "Tattoo dysplasia" or "Fantasy Island syndrome."
It's about 3,500 times as tall as Kenny Baker
In other words, the height of Kenny Baker is 0.00028 times 4 kilometers.
(a.k.a. Kenneth George Baker) (1934-) (actor)
Kenny Baker, most famous for his role as R2-D2 in the Star Wars film franchise, is an LP with a height of 0.0011 kilometers. Baker and his wife, Eileen, both made brief appearances as the small, woodland creatures known as Ewoks in the 1984 Star Wars movie, Star Wars: Return of the Jedi (a.k.a. Star Wars Episode VI: Return of the Jedi).
It's about 4,500 times as tall as General Tom Thumb
In other words, the height of General Tom Thumb is 0.00023 times 4 kilometers.
(a.k.a. Charles Sherwood Stratton) (1838-1883) (circus performer; height at death)
General Tom Thumb was an LP with a height (at his death) of 0.00091 kilometers. Thumb stopped growing at 0.00064 kilometers when he was five years old, but resumed growth in his teens which continued through the remainder of his life.