SpaceX will launch a communications satellite early Monday morning and you can watch the liftoff live on its website.

The company's Falcon 9 rocket, with a used first stage, is scheduled to launch from Florida's Cape Canaveral Air Force Station during a four-hour widow starting at 12:29 a.m. Monday.

The rocket will carry the SES-12 satellite to orbit for the Luxembourg-based telecom company SES. The satellite is headed for geostationary orbit, about 22,300 miles above Earth's surface, and will provide video and data services to customers across the Asia-Pacific region, SES representatives said.

The launch was originally scheduled for early Wednesday morning, and then postponed again to early Friday. But the company announced the need for additional tests to the rocket's upper stage.

The first stage has flown once before, in September 2017, carrying the robotic X-37B space plane for the U.S. military. The booster then came back to Earth for a pinpoint landing shortly after that liftoff, but won't do this for the SES-12 mission. The first stage is part of the Falcon 9 "Block 4" build, which is an older variant that SpaceX is phasing out.

The company recently revealed the new Falcon 9 Block 5. Its first stages are designed to fly 10 times with inspections between landing and launch only, and 100 times or more with some refurbishment involved. Operating under such heavy reuse is the breakthrough expected to slash the cost of spaceflight, helping more lofty space exploration goals to be financially feasible, SpaceX founder and CEO Elon Musk has said.

Musk also wants to reuse the two-stage Falon 9's upper stage and its payload fairing -- the nose cone that protects satellites during launch. So far, only the first stages have been landed and launched again.

SpaceX has landed these boosters 25 times, and reflown them on a dozen occasions.

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Two sportscar-sized satellites in orbit to measure Earth's water
Washington DC (AFP) May 22, 2018
A SpaceX rocket Tuesday blasted off a duo of sports car-sized satellites built by the US and Germany to reveal changes in sea level rise, ice melt and drought on Earth. "Three, two, one, liftoff!" said a SpaceX commentator as the Falcon 9 rocket launched from Vandenberg Air Force Base in California at 12:47 pm Pacific time (1947 GMT). The $521 million payload, called the Gravity Recovery and Climate Experiment Follow-on (GRACE-FO), was successfully deployed into its planned orbit some 310 mi ... read more