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.
This article is about the mission that launched in 2003. For the Mars rover that landed in 2012, see Curiosity (rover). For the generic topic, see Mars rover. NASA's Mars Exploration Rover (MER) mission is an ongoing robotic space mission involving two Mars rovers, Spirit and Opportunity, exploring the planet Mars. It began in 2003 with the sending of the two rovers: MER-A Spirit and MER-B Opportunityâto explore the Martian surface and geology.