2020s in spaceflight. This article documents expected notable spaceflight events during the 2020s.

Overview 
The trend towards cost reduction in access to orbit is expected to continue. Vulcan is replacing its more expensive predecessors. Since 2023, SpaceX is testing its fully reusable Starship with orbital missions. In 2024, Blue Origin plans the maiden flight of New Glenn with a reusable first stage and Ariane 6 is expected to replace the retired more expensive Ariane 5.

Mars stays a focus for missions to other planets, with three missions launched in 2020 (by China, the United Arab Emirates and the United States) and at least one mission planned for 2024, 2026 and 2028.

In 2028, as part of the NASA-ESA Mars Sample Return mission, NASA plans to launch a Sample Retrieval Lander. In 2027, ESA plans to launch the Earth Return Orbiter, which will transport the retrieved samples from Mars to Earth by 2033. China is also planning to retrieve samples from Mars by 2031.

NASA plans a return of humans to the Moon by 2025. The first uncrewed launch of the Space Launch System happened in 2022. The first crewed launch is planned for September 2025. In addition NASA plans to assemble the Lunar Gateway in lunar orbit. A crewed exploration of Mars could follow in the mid 2030s. SpaceX, a private company, has also announced plans to land humans on Mars in the 2020s, with the long-term goal of enabling the colonization of Mars.

India plans to launch its first crewed flight with a spacecraft called Gaganyaan on a home-grown GSLV Mark III rocket in 2025. The mission would make India the fourth nation to launch a crewed spaceflight after Russia, the US and China. India also plans to launch its second Mars probe, Mars Orbiter Mission 2 (Mangalyaan 2).

The James Webb Space Telescope was launched in 2021. NASA plans to launch the Nancy Grace Roman Space Telescope, which will have a field of view 100 times larger than that of the Hubble Space Telescope, between October 2026 and May 2027.

NASA's NEO Surveyor, scheduled to launch no later than June 2028, is expected to be capable of detecting at least 90% of near-Earth objects larger than , a goal mandated by the US Congress in 2005.

The number of small satellites launched annually was expected to grow to around one thousand (2018 estimate), mainly communication satellites in large constellations but launches quickly exceeded this estimate, mainly due to the rapid deployment of the Starlink and OneWeb constellations. From 2020 to 2022, around 3500 Starlink satellites and 500 satellites by OneWeb were launched.

The number of total satellites reached 10,000 for the first time in 2024.

Event timeline
NASA's Mars 2020 mission, which includes the Perseverance rover, was successfully launched on 30 July 2020 to study the habitability of Mars in preparation for future human missions.
The Chang'e 5 successfully landed on the surface of the Moon in 2020.
 16 September 2021, SpaceX launched Inspiration4. It was the first orbital launch of an all-private crew, including the first person with a prosthesis who was also the youngest person in space (aged 29). 
 NASA's Artemis I mission to the Moon launched on 16 November 2022 to test the Space Launch System rocket.
 The James Webb Space Telescope was successfully launched on 25 December 2021. On 12 July 2022, the first full-color images captured were released to the public which included Webb's First Deep Field and others.
 India hopes to conduct its first human spaceflight, Gaganyaan in late 2024.
 The first component of the Lunar Gateway, a proposed inhabitable space station to be implemented by multiple international space agencies on the Moon, the Power and Propulsion Element, is set to be delivered by a SpaceX Falcon Heavy in November 2024.
 ESA's Jupiter Icy Moons Explorer was launched on 14 April 2023.
 On 7 October 2024, the Hera spacecraft was launched successfully. It will arrive at the asteroid Didymos in 2026 after Mars flyby, where it will study the effects of the Double Asteroid Redirection Test.
On 13 October 2024, SpaceX achieves the first successful return and capture of a Super Heavy booster from Starship, the biggest and most powerful rocket ever to fly.
On 14 October 2024, NASA launched the Europa Clipper on 14 October 2024, which will study the Jovian moon Europa while in orbit around Jupiter.
 SpaceX founder and entrepreneur Elon Musk plans to send the first Starship to Mars in 2029, paving the way to the colonization of the planet.
 NASA plans to send "the first woman and the next man" to the Lunar south pole region via Artemis III in 2025.
 The European Space Agency plans to begin mining the Moon for natural resources by 2025.

References

External links

 
Space