South Korea was preparing to test-launch its first domestically produced space rocket on Thursday in what officials describe as an important step in its pursuit of a satellite launch program.
If weather and other conditions prevail, the three-stage Nuri rocket was expected to be launched at around 5 pm (0800 GMT) with an aim to deliver a dummy payload a 1.5-ton block of stainless steel and aluminum into orbit 600 to 800 km (372 to 497 miles) above Earth.
The launch was initially scheduled an hour earlier but was delayed because engineers needed more time to examine some valves inside the rocket, South Korean Vice Science Minister Yong Hong-taek told reporters. He said no problems were immediately found but the launch could still be moved depending on wind and other conditions at the planned time for blastoff.
Engineers had completed erecting the 47-metre (154 foot) rocket Wednesday night on a launch pad at the Naro Space Centre, the country's lone spaceport, on a small island off its southern coast.
After relying on other countries to launch its satellites since the early 1990s, South Korea is now trying to become the 10th nation to send a satellite into space with its own technology.
Officials say such an ability would be crucial for the country's space ambitions, which include plans for sending more advanced communications satellites and acquiring its own military intelligence satellites. The country is also hoping to send a probe to the moon by 2030.
Nuri is the country's first space launch vehicle built entirely with domestic technology. The three-stage rocket is powered by five 75-ton class rocket engines placed in its first and second stages.
Scientists and engineers at the Korea Aerospace Institute plan to test Nuri further, including conducting another launch with a dummy device in May 2022, before trying with a real satellite.
South Korea had previously launched a space launch vehicle from the Naro spaceport in 2013, which was a two-stage rocket built mainly with Russian technology.
That launch came after years of delays and consecutive failures the rocket, named Naro, reached the desired altitude during its first test in 2009 but failed to eject a satellite into orbit, and then exploded shortly after takeoff during its second test in 2010.
It wasn't clear how North Korea, which had been accused of using its space launch attempts in past years as a disguise for developing long-range missile technology, would react to Thursday's launch.
While pushing to expand its nuclear and missile programme, the North had shown sensitivity about South Korea's increasing defence spending and efforts to build more powerful conventionally armed missiles.
In a speech to Pyongyang's rubber-stamp parliament last month, North Korean leader Kim Jong Un accused the US and South Korea of destroying the stability and balance in the region with their allied military activities and a US-led excessive arms buildup in the South.
While Nuri is powered by liquid propellants that need to be fuelled shortly before launch, the South Koreans plan to develop a solid-fuel space launch rocket by 2024, which possibly could be prepared for launch more quickly and also be more cost effective.
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