If its API gravity is greater than 10, it is lighter and floats on water; if less than 10, it is heavier and sinks. API is the American Petroleum Institute. WTI Crude API gravity of around 39.6. Brent Crude has an API gravity of around 38.06. OPEC basket of oil from 7 countries is the sourest, At present the API gravity for the Basket is heavier, at 32.7. Location: Brent Blend is a combination of crude oil from 15 different oil fields in the North Sea. It is less âlightâ and âsweetâ than WTI, but still excellent for making gasoline.
The first telescopic observation of Mars was by Galileo Galilei in 1610. Within a century, astronomers discovered distinct albedo features on the planet, including the dark patch Syrtis Major Planum and polar ice caps. They were able to determine the planet's rotation period and axial tilt.
Mars is the focus of much scientific study about possible human colonization. Mars' surface conditions and past presence of water make it arguably the most hospitable planet in the Solar System besides Earth. Mars requires less energy per unit mass to reach from Earth than any planet, except Venus. Permanent human habitation on other planets, including Mars, is one of science fiction's most prevalent themes. As technology advances, and concerns about humanity's future on Earth increase, argument