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How long is 0.50 kilometers?

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It's about 5,000,000 times as tall as a sheet of Paper.
In other words, the height of a sheet of Paper is 0.000000200 times 0.50 kilometers.
(for US Letter, a.k.a. ANSI A; 215.9mm by 279.4mm (8.5 in x 11 in); 20lb)
A single sheet of 20 lb, 8.5 inch x 11 inch paper is just 0.0000001000 kilometers thick. This style of paper weighs a mere 5 g per sheet.
It's about 5,000,000 times as long as a Strand of Hair.
In other words, the length of a Strand of Hair is 0.000000200 times 0.50 kilometers.
(average)
A strand of human hair averages 99 µm (micrometers), with blond hair being the finest and black hair the thickest. On a healthy scalp, each strand of hair will last up to 6 years.
It's about 5,000,000 times as tall as a Human hair, Strand of.
In other words, the height of a Human hair, Strand of is 0.000000200 times 0.50 kilometers.
(average)
A strand of human hair averages 99 µm (micrometers), with blond hair being the finest and black hair the thickest. On a healthy scalp, each strand of hair will last up to 6 years.
It's about 65,000,000 times as long as a Red Blood Cell.
In other words, the length of a Red Blood Cell is 0.0000000150 times 0.50 kilometers.
(a.k.a. RBCs, a.k.a. haematids, a.k.a. erythrocyte, a.k.a. erythroid cells, a.k.a. red blood corpuscles) An average Red Blood Cell measures 7.5 µm (micrometers) in diameter. An average human has 20 - 30 trillion red blood cells in their body and each cell completes a circulatory lap in about 20 seconds.
It's about 85,000,000 times as long as a Nucleus (Cellular).
In other words, the length of a Nucleus (Cellular) is 0.0000000120 times 0.50 kilometers.
(for animal cell)
The nucleus of an animal cell measures an average of 0.00000000600 kilometers. The nucleus is the largest organelle in these cells, accounting for about 10% of the cell's total volume.
It's about 250,000,000 times as long as an E. coli Bacterium.
In other words, the length of an E. coli Bacterium is 0.00000000400 times 0.50 kilometers.
(Escherichia coli) (rod-shaped configuration)
An rod-shaped E. coli bacterium measures about 0.00000000200 kilometers in length. A staple of biology labs, E. coli can reproduce in as little as twenty minutes.
It's about 250,000,000 times as long as a Mitochondrion.
In other words, 0.50 kilometers is 266,000,000 times the length of a Mitochondrion, and the length of a Mitochondrion is 0.000000003760 times that amount.
(Eukaryotic; average)
A mitochondrion measures between 0.75 and 3 micrometers (µm). The mitochondrion is commonly referred to as the powerhouse of the cell, responsible for the generation of ATP. The size, shape, and distribution of mitochondria varies widely, with human liver cells each having 1,000 to 2,000 mitochondria.