Io's metallic core makes up approximately 20% of its mass. Depending on the amount of sulfur in the core, the core has a radius between 350 and 650 km (220â400 mi) if it is composed almost entirely of iron, or between 550 and 900 km (340â560 mi) for a core consisting of a mix of iron and sulfur.
In 1886, Karl Benz developed a petrol- or gasoline-powered automobile. This is also considered to be the first production vehicle as Benz made several other identical copies. At the turn of the 20th century electrically powered automobiles appeared but only occupied a niche market until the turn of the 21st century.
For the record, the answer to the question who invented the automobile is Karl Benz in Germany in 1885-86. If we want to be more pedantic, Benz invented the first true automobile, that is a car that runs on gasoline. The first âhorseless carriageâ was created by Frenchman Nicolas-Joseph Cugnot in 1769 (steam powered) and a Scot by the name of Robert Anderson created an electric vehicle in the 1830s. The first automobile made in the United States came along in 1893.