The reclusive North Korea is poised to launch a rocket, possibly as early as Thursday, on a mission that has provoked scorn from the international community, which sees the flight as a missile test in disguise.
North Korean officials have said the country's new Unha-3 rocket will launch an Earth-observing satellite between April 12 and April 16 in honor of the 100th anniversary of the birth of Kim Il Sung, the country's founder.
But questions remain over the true nature of the launch and the state of North Korea's rocket technology. Below, Space.com looks at five big questions, and some answers, facing North Korea's newest rocket launch.
Is it really a space rocket or a ballistic missile?
It depends on whom you ask. North Korean officials say the Unha-3 rocket is meant as an unmanned space launch vehicle to carry satellites into orbit. It is a three-stage rocket and the latest in the Unha (or "Galaxy") vehicle series. [ Images: North Korea's Rocket Program ]
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North Korean space officials claim the rocket will demonstrate their country's technical achievements and the "might of another space power advancing towards the world standards by pushing back the frontiers of latest science and technology," according to the state-run Korean Central News Agency.
Observers in the United States, Japan and South Korea say the Unha-3 test is a ballistic missile demonstration in disguise, with the current launch aimed at verifying military weapon technology.
North Korea's announcement of the rocket launch in March was seen as a surprisingly provocative move since it came after the impoverished nation agreed with the United States to suspend future missile tests in return for food aid.
What is the rocket's mission?
The Unha-3 rocket stands about 100 feet (30 meters) tall and will lift off from a new launch site near the village of Tongchang-ri in northwest North Korea. [ Infographic: North Korea's Unha-3 Rocket Explained ]
KCNA describes the launch site as the Sohae Satellite Launching Station in the Cholsan County of North Phyongan Province. The launch site is about 35 miles (50 kilometers) from the city of Dandong on the Chinese border.
According to North Korean officials, the Unha-3 rocket will launch a satellite called Kwangmyongsong-3 ("Bright Shining Star-3"). The spacecraft is a "polar-orbiting Earth-observation satellite" and will monitor forest resources, natural disasters, aid in food crop planning and weather monitoring, according to the KCNA.
Video and images of the Kwangmyongsong-3 satellite in various media reports show it to be a solar-powered craft about the size of a small filing cabinet.
The rocket's flight path will carry it southward, with the first stage dropping into the Yellow Sea and third stage falling into ocean waters around the Philippines, according to press reports. South Korean officials have vowed to shoot down any pieces of the North's rocket that look as if they will fall on South Korean territory.
What makes it hard for North Korean rockets to reach orbit?
Aside from the many technical hurdles, North Korea's location on Earth makes it a particularly tricky spot from which to launch rockets into space.
North Korea is located at the latitude of 39.4 degrees north of the equator. The closer a launch site is to the equator, the easier it is to send payloads into orbit because of the boost gained by the increasing surface speed of Earth's rotation.
Being so far from the equator — about 2,700 miles (4,300 km) away, compared with about 1,950 miles (3,100 km) away in the case of NASA's spaceport in Cape Canaveral, Fla. — can make it difficult to reach the more-traveled orbit inclinations used by other nations.
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"They can only directly launch into inclinations higher than their latitude, which for this new facility is 39.4 degrees," Brian Weeden, a former orbital analyst with the U.S. Air Force who is now a technical adviser at the Secure World Foundation, told Space.com. "So to get to a low-inclination orbit such as GEO, they would need to do a pretty big maneuver after it’s in orbit to change the inclination."
Also, the country's relatively close proximity to China, South Korea, Japan and the Philippines makes finding a clear launch range over ocean difficult. A clear range is important to avoid injuries or damage on the ground that could be caused by a rocket failure.
Does the rocket have a chance at success?
With this being the first launch of the Unha-3 rocket design, its success or failure is difficult to predict. But North Korea's two previous attempts to launch a satellite did fail to reach orbit.
In 1998, the country launched the 83-foot-tall (25-meter) Taepodong-1 rocket — actually a converted missile — carrying the small satellite Kwangmyongsong-1. While North Korean officials claimed the satellite successfully reached orbit and broadcast patriotic songs, Western observers concluded the test flight was a failure.
In April 2009, North Korea again tried to launch a satellite, this one called Kwangmyongsong-2. That launch used an advanced version of the Taepodong-2 rocket ; it ultimately crashed into the Pacific Ocean, according to Western observers. The rocket's third stage apparently failed to ignite as planned, according to an analysis at the time. As with the 1998 test, North Korean officials maintained the launch was a success.
How will North Korea announce launch success or failure?
Should the rocket fail, past experience suggests confirmation of the failure would come from outside observers and not through official North Korean channels.
After North Korea's 2009 launch failure, the results of that mission came from independent analysis. While North Korean officials claimed the launch was a success, outside observers saw no evidence of any satellite reaching orbit.
If North Korea's new Unha-3 rocket succeeds to place a satellite into orbit, an official announcement would be expected.
In an unprecedented move, the country opened its rocket launch site to foreign reporters in recent days, offering a glimpse of the reclusive nation's technological progress and space program facilities. Whether that means the launch time of Unha-3 would be announced in advance or publicly televised, however, remained to be seen.
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