For example, Apollo 13 was forced to abort a planned moon landing when an oxygen tank ruptured. However, NASA has also seen its share of failed missions, some of which ended in tragedy. NASA's most famous missions are arguably the Apollo program, which cost $20.4 billion (in the 1960s, which translates to an estimated $236 billion in modern dollars) and resulted in astronauts walking on the moon on six different occasions: Apollo missions 11, 12, 14, 15, 16, & 17. Additional NASA achievements include the space shuttle program, the Voyager and Mariner probes, and the Mars rovers Curiosity and Perseverance. Thanks to NASA, America was the second country to send humans to space, the first country to land humans on the moon, and one of the major contributors to the International Space Station, or ISS. With a budget nearly twice that of the next-highest agency, the United States' National Aeronautics and Space Administration (NASA) is easily the most prolific and active space agency in the world. 16 Space Agencies Capable of Completing Space Launches (2022): Agency To date, only the United States has landed humans on the moon, a feat NASA completed on six different missions between 19. Of those, three are known to be able to conduct human spaceflights. Of the 70+ space agencies in the world as of mid-2022, only 16 possessed the ability to conduct a space launch, and seven had the capability to send a probe to extraterrestrial locations such as the moon, Mars, or deep space. Space agencies vary greatly in terms of their capability. Additionally, an increasing number of private space agencies continue to spring into existence, such as SpaceX and Blue Origin, typically based around space tourism. In reality, more than 70 space agencies exist around the world, particularly in countries that are technologically advanced or have high military spending, with more than a dozen additional agencies on the way. While many of Earth's people are aware of high-profile space programs such as the United States' NASA, Russia's ROSCOSMOS, China's CNSA, and the European Space Agency (ESA)-a multinational alliance of 22 European nations-these are far from the only space agencies on Earth.
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