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.
The early history of the automobile can be divided into a number of eras, based on the prevalent means of propulsion. Later periods were defined by trends in exterior styling, size, and utility preferences. In 1769 the first steam-powered automobile capable of human transportation was built by Nicolas-Joseph Cugnot.
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.