The first SpaceX astronauts shrug off a spate of design and test mishaps, saying such setbacks were "part of the process".
Elon Musk's SpaceX discloses having raised more than US$1 billion in equity offerings during the last few months.
A SpaceX spokesperson said the company sued to 'ensure a level playing field for competition.'
SpaceX's latest launch has been postponed for a week due to weather conditions, in addition to necessary checks and software updates conducted by the Elon Musk-owned company.
Elon Musk's SpaceX poised to launch orbital constellation which beams broadband to areas on Earth with limited access to the internet, a wager fellow billionaire Jeff Bezos is also betting on.
A photo on the Florida Today website showed large amounts of smoke pouring out of the test site.
SpaceX said its teams are investigating the cause of the anomaly, and are working closely with NASA partners.
SpaceX set a company record last year with 21 launches for customers.
SpaceX has two operational rockets: the Falcon 9 and the Falcon Heavy, which is designed to lift much heavier payloads into more distant orbits.
After a 5-day mission on the orbital outpost, Crew Dragon autonomously detached and sped back to earth reaching hypersonic speeds before a splash-down in the Atlantic, about 200 miles off the Florida coast.
This is a key milestone for Elon Musk, his team and the American space agency
The capsule has made two orbits since its launch from the Kennedy Space Centre.
The 27-foot long Crew Dragon will carry some cargo, radiation monitors and a full-scale “dummy” to replicate an astronaut.
The certification of SpaceX in 2015 helped the company take on military payloads, which brought in competition to the field of space launches.
The effort aims to cut the costs of spaceflight and make expensive rocket parts more reusable, like aeroplanes.
SpaceX has said the duo could one day transport people from city to city on Earth, as well as propel passengers around the Moon, to the lunar surface, and even to Mars and back.
SpaceX has been a contractor for Nasa since 2012.
Rocket Lab represents a dramatic shift in the launch industry toward smaller, cheaper rockets that fly almost every day.
It will be the first manned US launch to the orbiting research laboratory since the space shuttle program was retired in 2011.
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SpaceX earlier this month launched a commercial satellite from Florida that marked its 16th mission of 2018.
In February, 2017, SpaceX announced it would send the world's first two space tourists around the Moon in late 2018.
Musk said Saudi Arabia's sovereign wealth fund manager had voiced support for the company going private several times, but also said that talks continue with the fund and other investors.
SpaceX landed the Falcon 9’s first stage on one of its drone-ships, named “Of Course I Still Love You,” which is stationed in the Atlantic Ocean.
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