Nevertheless, Trump's swooning speech embracing Elon Musk, along with the SpaceX founder's appointment to lead a new department of government efficiency could indicate a different approach to the industrial and human spaceflight aspects of space policy.
Illustrating the potential for continuity, the increasing commercialisation of Nasa projects and services under the first Trump administration was actually the result of policies initiated during the Obama years. Changes, such as Trump's striking establishment of the US Space Force and the re-establishment of US Space Command in 2019, were mostly bureaucratic and organisational. They did not fundamentally alter US military space capabilities.
The US has continued decades-long projects such as the modernisation of GPS and the development of sophisticated systems to, among other things, identify, monitor, track and follow objects in space - from satellites to debris. These systems include highly manoeuvrable spacecraft, including the X-37B spaceplane and the GSSAP and Silent Barker satellites.
Even the US Artemis programme to return humans to the Moon is a continuation of the first Trump administration's grandiose vision. The Biden administration did not undo it and furthered other longer-term space policies such as transferring more space tracking duties from the Pentagon to the civilian Department of Commerce.
Moving some space tracking duties away from the military is more conducive to developing a Space Traffic Management regime, which should reduce the risks of accidental collisions in outer space. This was the focus of a document called Space Policy Directive-3, issued by the first Trump administration in 2018.
Still, there are questions about what changes or uncertainties can be expected. The space journalist Marcia Smith notes that Trump's disposition towards Artemis, SpaceX and Elon Musk and Mars exploration could see more funds funnelled into US human spaceflight programmes.
This may be at the further expense of Earth and atmospheric sciences at Nasa and the National Oceanic and Atmospheric Administration (Noaa), which have been cut during the Biden era.
Efficiency drive
Vice-president-elect J.D. Vance will chair the National Space Council, which develops policy on civil, commercial, international and national security. Many of the first Trump administration's space policy successes can be traced to the council. Given the influence Musk seems likely to have in the new administration, the National Space Council could be seen as duplicating or being in conflict with the objectives of SpaceX's founder.
Musk will co-lead the department of government efficiency, which will "dismantle government bureaucracy" and "slash excess regulations", among other things. So could the council become a casualty of these drives? If it survives, its future potential depends on who is named as the executive secretary, a position that has significant power.
If the council becomes purely industry driven and shaped by personal rule, it could destroy a balance struck during the first Trump administration between enhancing US space industry and performing as a collaborative leader within the international community. Future policy may continue reducing perceived and real regulatory burdens on the commercial space sector and international partnerships.
International relations
On the international front, there's uncertainty over whether a US ban on the testing of weapons that can destroy satellites will survive this Trump administration. These are known as direct-ascent kinetic-energy anti-satellite (Asat) weapons.
Neither the Obama, first Trump, nor Biden administrations oversaw an Asat test, which often involve launching missiles from Earth to intercept and destroy a satellite in orbit, despite Indian and Russian tests in 2019 and 2021, respectively. The Asat test ban declared by vice-president Harris in 2022 effectively formalised a longstanding bipartisan approach.
Revoking the ban could undermine the US's international position in the development of international norms and regulations in space, as many other states have agreed to the moratorium. The test ban has provided much-needed momentum into UK-led discussions at the UN general assembly and an Open Ended Working Group that aims to identify common threats and responsible behaviour in outer space. If the Asat test ban is rescinded, that momentum could be undone.
It could also return the UN to a decades-long logjam over a Russian and Chinese-sponsored draft treaty that aims to control the use of weapons in space. Critics say the draft treaty is full of loopholes and it is opposed by the US and UK. However, US withdrawal from the Asat test ban would be consistent with Trump's rhetoric on offensive space operations found in Space Policy Directive-4.
Contrary to the bellicose rhetoric, the first Trump administration drove more international involvement and cooperation in its Artemis lunar exploration programme. It is unlikely that the new Trump administration will seek to withdraw from the Outer Space Treaty (OST) of 1967, which governs the exploration and use of bodies such as the Moon, because the Artemis programme explicitly reinforces key provisions of the OST. The US lunar programme does this through the Artemis Accords, a set of principles designed to enable the peaceful and sustainable use of space.
With 47 signatories - including India and several developing states - the Artemis Accords show a growing global acceptance of America's longer-term exploration plans for the Moon, as well as a belief in the continuing value of the OST.
Undermining the OST and Artemis' international dimensions would undercut an important response to China's own pursuit of international support for its lunar exploration programme - the International Lunar Research Station.
The real question will be whether the Trump administration can maintain the renewed interest in US space leadership that goes beyond leading in metrics and numbers and seeks to secure a long-term vision of space based on US leadership rather than dominance. The current US approach, found in initiatives such as the Artemis Accords, has been a significant shift from the early 2000s approach that eschewed multilateral discussions of norms and rules of any type.
However, Trump's penchant for fiery rhetoric, spontaneous announcements, which may be shaped by industrial interests and the Martian gaze of Elon Musk, as well as alienating US allies, could easily undermine these efforts. Under the second Trump administration, there is a continued opportunity to make advances in space policy at both the domestic and international levels, but any such advances are likely to be in spite of Trump rather than because of him.