Final answer:
The size of a white dwarf is best represented by the Earth, as white dwarfs have a radius similar to that of our planet despite their high mass and density.
Step-by-step explanation:
The object that best represents the size of a white dwarf is Earth. While a white dwarf is a star, it is much smaller than a red giant, a Sun-like star, or even a red dwarf. Through various astrophysical observations and calculations, it has been determined that a typical white dwarf has a radius comparable to Earth's.The size of a white dwarf is best represented by the Earth, as white dwarfs have a radius similar to that of our planet despite their high mass and density.
For example, a nearby white dwarf, 40 Eridani B, has a radius that is only about 1.4% of the Sun's radius, which is similar to Earth's. Despite this small size, white dwarfs have a mass of about 0.57 times that of the Sun and possess an incredibly high density, making them unique among stellar objects.