Washington, April 17: NASA is now targeting Wednesday for the launch of its next planet-hunting mission, the Transiting Exoplanet Survey Satellite, or Tess.
The spacecraft was earlier scheduled to launch on a SpaceX Falcon 9 rocket from Cape Canaveral Air Force Station in Florida on Monday (4.02 a.m. on Tuesday, India time).
"Standing down today to conduct additional GNC (guidance, navigation and control) analysis, and teams are now working towards a targeted launch of @NASA_TESS on Wednesday, April 18," SpaceX said in a tweet on Monday .
NASA in a blog post said that the Tess spacecraft is in excellent health, and remains ready for launch.
Tess is NASA's next step in the search for exoplanets, including those that could support life.
Once in orbit, Tess will spend about two years surveying 200,000 of the brightest stars near the Sun to search for planets outside our solar system.
It will find the most promising exoplanets orbiting relatively nearby stars, giving future researchers a rich set of new targets for more comprehensive follow-up studies, including the potential to assess their capacity to harbour life.
With the help of a gravitational assist from the Moon, the spacecraft will settle into a 13.7-day orbit around Earth, NASA said in an earlier statement.
Sixty days after the launch and following tests of its instruments, the satellite will begin its initial two-year mission. Four wide-field cameras will give Tess a field-of-view that covers 85 percent of our entire sky.
Within this vast visual perspective, the sky has been divided into 26 sectors that Tess will observe one by one.
The first year of observations will map the 13 sectors encompassing the southern sky, and the second year will map the 13 sectors of the northern sky.
The spacecraft will be looking for a phenomenon known as a transit, where a planet passes in front of its star, causing a periodic and regular dip in the star's brightness.
NASA's Kepler spacecraft used the same method to spot more than 2,600 confirmed exoplanets, most of them orbiting faint stars 300 to 3,000 light-years away.
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Trump confronts South African president over killing of white farmers
Washington, May 21 (AP): President Donald Trump used a White House meeting to confront South African President Cyril Ramaphosa, accusing his country of failing to address the killing of white farmers.
“People are fleeing South Africa for their own safety," said Trump, who at one point dimmed the lights in the Oval Office to play a video of a communist politician playing a controversial anti-apartheid song that includes lyrics about killing a farmer. "Their land is being confiscated and in many cases they're being killed."
Ramaphosa pushed back against Trump's accusation. The South African leader had sought to use the meeting to set the record straight and salvage his country's relationship with the United States. The bilateral relationship is at its lowest point since South Africa enforced its apartheid system of racial segregation, which ended in 1994.
“We are completely opposed to that,” Ramaphosa said of the behaviour alleged by Trump in their exchange.
Experts in South Africa say there is no evidence of whites being targeted, although farmers of all races are victims of violent home invasions in a country that suffers from a very high crime rate.
