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s moon titan resulting in a trajectory incompatible with a pluto flyby voyager 2 never had a plausible trajectory for reaching pluto 46 after an intense political battle a mission to pluto dubbed new horizons was granted funding from the united states government in 2003 47 new horizons was launched successfully on 19 january 2006 in early 2007 the craft made use of a gravity assist from jupiter its closest approach to pluto was on 14 july 2015 scientific observations of pluto began five months prior to closest approach and continued for 16 days after the encounter kuiper belt objects edit the new horizons mission also performed a flyby of the small planetesimal arrokoth in the kuiper belt in 2019 this was its first extended mission 48 comets edit main article list of missions to comets comet 103p hartley 2010 although many comets have been studied from earth sometimes with centuries worth of observations only a few comets have been closely visited in 1985 the international cometary explorer conducted the first comet fly by 21p giacobini zinner before joining the halley armada studying the famous comet the deep impact probe smashed into 9p tempel to learn more about its structure and composition and the stardust mission returned samples of another comet s tail the philae lander successfully landed on comet churyumov gerasimenko in 2014 as part of the broader rosetta mission deep space exploration edit main article deep space exploration this high resolution image of the hubble ultra deep field includes galaxies of various ages sizes shapes and colors the smallest reddest galaxies are some of the most distant galaxies to have been imaged by an optical telescope deep space exploration is the branch of astronomy astronautics and space technology that is involved with the exploration of distant regions of outer space 49 physical exploration of space is conducted both by human spaceflights deep space astronautics and by robotic spacecraft some of the best candidates for future deep space engine technologies include anti matter nuclear power and beamed propulsion 50 beamed propulsion appears to be the best candidate for deep space exploration presently available since it uses known physics and known technology that is being developed for other purposes 51 future of space exploration edit main article future of space exploration concept art for a nasa vision mission artistic image of a rocket lifting from a saturn moon breakthrough starshot edit main article breakthrough starshot breakthrough starshot is a research and engineering project by the breakthrough initiatives to develop a proof of concept fleet of light sail spacecraft named starchip 52 to be capable of making the journey to the alpha centauri star system 4 37 light years away it was founded in 2016 by yuri milner stephen hawking and mark zuckerberg 53 54 asteroids edit main article exploration of the asteroids an article in the science magazine nature suggested the use of asteroids as a gateway for space exploration with the ultimate destination being mars in order to make such an approach viable three requirements need to be fulfilled first a thorough asteroid survey to find thousands of nearby bodies suitable for astronauts to visit second extending flight duration and distance capability to ever increasing ranges out to mars and finally developing better robotic vehicles and tools to enable astronauts to explore an asteroid regardless of its size shape or spin furthermore using asteroids would provide astronauts with protection from galactic cosmic rays with mission crews being able to land on them without great risk to radiation exposure artemis program edit main article artemis program the artemis program is an ongoing crewed spaceflight program carried out by nasa u s commercial spaceflight companies and international partners such as esa 55 with the goal of landing the first woman and the next man on the moon specifically at the lunar south pole region artemis would be the next step towards the long term goal of establishing a sustainable presence on the moon laying the foundation for private companies to build a lunar economy and eventually sending humans to mars in 2017 the lunar campaign was authorized by space policy directive 1 using various ongoing spacecraft programs such as orion the lunar gateway commercial lunar payload services and adding an undeveloped crewed lander the space launch system will serve as the primary launch vehicle for orion while commercial launch vehicles are planned for use to launch other elements of the campaign 56 nasa requested 1 6 billion in additional funding for artemis for fiscal year 2020 57 while the u s senate appropriations committee requested from nasa a five year budget profile 58 which is needed for evaluation and approval by the u s congress 59 60 as of 2026 the first artemis mission was launched in 2022 with the second mission a crewed lunar flyby launched in april 2026 61 construction on the lunar gateway is underway with initial capabilities set for the 2025 2027 timeframe 62 the first clps lander landed in 2024 marking the first us spacecraft to land since apollo 17 63 rationales edit main article space advocacy astronaut buzz aldrin had a personal communion service when he first arrived on the surface of the moon the research that is conducted by national space exploration agencies such as nasa and roscosmos is one of the reasons supporters cite to justify government expenses economic analyses of the nasa programs often showed ongoing economic benefits such as nasa spin offs generating many times the revenue of the cost of the program 64 it is also argued that space exploration would lead to the extraction of resources on other planets and especially asteroids which contain billions of dollars worth of minerals and metals such expeditions could generate substantial revenue 65 in addition it has been argued that space exploration programs help inspire youth to study in science and engineering 66 space exploration also gives scientists the ability to perform experiments in other settings and expand humanity s knowledge 67 another claim is that space exploration is a necessity to humankind and that staying on earth will eventually lead to extinction some of the reasons are lack of natural resources comets nuclear war and worldwide epidemic stephen hawking renowned british theoretical physicist said i don t think the human race will survive the next thousand years unless we spread into space there are too many accidents that can befall life on a single planet but i m an optimist we will reach out to the stars 68 author arthur c clarke 1950 presented a summary of motivations for the human exploration of space in his non fiction semi technical monograph interplanetary flight 69 he argued that humanity s choice is essentially between expansion off earth into space versus cultural and eventually biological stagnation and death these motivations could be attributed to one of the first rocket scientists in nasa wernher von braun and his vision of humans moving beyond earth the basis of this plan was to develop multi stage rockets capable of placing satellites animals and humans in space development of large winged reusable spacecraft capable of carrying humans and equipment into earth orbit in a way that made space access routine and cost effective construction of a large permanently occupied space station to be used as a platform both to observe earth and from which to launch deep space expeditions launching the first human flights around the moon leading to the first landings of humans on the moon with the intent of exploring that body and establishing permanent lunar bases assembly and fueling of spaceships in earth orbit for the purpose of sending humans to mars with the intent of eventually colonizing that planet 70 known as the von braun paradigm the plan was formulated to lead humans in the exploration of space von braun s vision of human space exploration served as the model for efforts in space exploration well into the twenty first century with nasa incorporating this approach into the majority of their projects 70 the steps were followed out of order as seen by the apollo program reaching the moon before the space shuttle program was started which in turn was used to complete the international space station von braun s paradigm formed nasa s drive for human exploration in the hopes that humans discover the far reaches of the universe nasa has produced a series of public service announcement videos supporting the concept of space exploration 71 overall the u s public remains largely supportive of both crewed and uncrewed space exploration according to an associated press poll conducted in july 2003 71 of u s citizens agreed with the statement that the space program is a good investment compared to 21 who did not 72 human nature edit space advocacy and space policy 73 regularly invokes exploration as a human nature 74 topics edit main articles space science and human presence in space spaceflight edit main articles spaceflight and astronautics delta v s in km s for various orbital maneuvers spaceflight is the use of space technology to achieve the flight of spacecraft into and through outer space spaceflight is used in space exploration and also in commercial activities like space tourism and satellite telecommunications additional non commercial uses of spaceflight include space observatories reconnaissance satellites and other earth observation satellites a spaceflight typically begins with a rocket launch which provides the initial thrust to overcome the force of gravity and propels the spacecraft from the surface of earth once in space the motion of a spacecraft both when unpropelled and when under propulsion is covered by the area of study called astrodynamics some spacecraft remain in space indefinitely some disintegrate during atmospheric reentry and others reach a planetary or lunar surface for landing or impact satellites edit main article satellite satellites are used for a large number of purposes common types include military spy and civilian earth observation satellites communication satellites navigation satellites weather satellites and research satellites space stations and human spacecraft in orbit are also satellites commercialization of space edit main article commercialization of space the commercialization of space first started out with the launching of private satellites by nasa or other space agencies current examples of the commercial satellite use of space include satellite navigation systems satellite television satellite communications such as internet services and satellite radio the next step of commercialization of space was seen as human spaceflight flying humans safely to and from space had become routine to nasa and russia 75 reusable spacecraft were an entirely new engineering challenge something only seen in novels and films like star trek and war of the worlds astronaut buzz aldrin supported the use of making a reusable vehicle like the space shuttle aldrin held that reusable spacecraft were the key in making space travel affordable stating that the use of passenger space travel is a huge potential market big enough to justify the creation of reusable launch vehicles 76 space tourism is a next step in the use of reusable vehicles in the commercialization of space the purpose of this form of space travel is personal pleasure private spaceflight companies such as spacex and blue origin and commercial space stations such as the axiom space and the bigelow commercial space station have changed the cost and overall landscape of space exploration and are expected to continue to do so in the near future alien life edit main articles astrobiology and extraterrestrial life astrobiology is the interdisciplinary study of life in the universe combining aspects of astronomy biology and geology 77 it is focused primarily on the study of the origin distribution and evolution of life it is also known as exobiology from greek έξω exo outside 78 79 80 the term xenobiology has been used as well but this is technically incorrect because its terminology means biology of the foreigners 81 astrobiologists must also consider the possibility of life that is chemically entirely distinct from any life found on earth 82 in the solar system some of the prime locations for current or past astrobiology are on enceladus europa mars and titan 83 human spaceflight and habitation edit main articles human spaceflight bioastronautics effect of spaceflight on the human body space medicine space architecture space station space habitat facility and space habitat settlement crew quarters on zvezda the base iss crew module to date the longest human occupation of space is the international space station which has been in continuous use for 25 years 314 days valeri polyakov s record single spaceflight of almost 438 days aboard the mir space station has not been surpassed the health effects of space have been well documented through years of research conducted in the field of aerospace medicine analog environments similar to those experienced in space travel like deep sea submarines have been used in this research to further explore the relationship between isolation and extreme environments 84 it is imperative that the health of the crew be maintained as any deviation from baseline may compromise the integrity of the mission as well as the safety of the crew hence the astronauts must endure rigorous medical screenings and tests prior to embarking on any missions however it does not take long for the environmental dynamics of spaceflight to commence its toll on the human body for example space motion sickness sms a condition which affects the neurovestibular system and culminates in mild to severe signs and symptoms such as vertigo dizziness fatigue nausea and disorientation plagues almost all space travelers within their first few days in orbit 84 space travel can also have an impact on the psyche of the crew members as delineated in anecdotal writings composed after their retirement space travel can adversely affect the body s natural biological clock circadian rhythm sleep patterns causing sleep deprivation and fatigue and social interaction consequently residing in a low earth orbit leo environment for a prolonged amount of time can result in both mental and physical exhaustion 84 long term stays in space reveal issues with bone and muscle loss in low gravity immune system suppression problems with eyesight and radiation exposure the lack of gravity causes fluid to rise upward which can cause pressure to build up in the eye resulting in vision problems the loss of bone minerals and densities cardiovascular deconditioning and decreased endurance and muscle mass 85 radiation is an insidious health hazard to space travelers as it is invisible and can cause cancer when above the earth s 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