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 rover is a motor vehicle that was designed and built by NASA scientists. It was operated by robots and launched into Mars. Till now five Mars rovers have been launched: 1. In 1971, the first one named Mars 2, Prop M rover was launched into Mars but it failed. 2. After that Mars 3, Prop M rover was launched but that device also failed. 3. On 4th July 1997, the third Mars rover-Sojourner rover landed successfully on Mars and until 27th September 1997 it was able to maintain communications with NASA. 4. On 4th January 2004, Spirit (MER-A), Mars Exploration Rover was launched successfully. There has been no communication from the rover since 22nd March 2010. 5. On 25th January 2004, the fifth rover named Opportunity (MER-B), Mars Exploration Rover, made it to Mars successfully and is still operating.