NASA has decided to extend a range of active planetary science missions, a move that is certain to delight scientists attached to the projects.

The oldest of which was launched more than 20 years ago, had been selected by the space agency to continue their operations because of their scientific productivity and potential to deepen our knowledge and understanding of the solar system and beyond.

The missions include Mars Odyssey, Mars Reconnaissance Orbiter, MAVEN, Mars Science Laboratory (Curiosity rover), InSight lander, and New Horizons.

NASA said that most of the selected missions will continue for three years if there are no faults. OSIRIS-REx will continue until the end of this year unless the electrical power system can be extended.

NASA's large investments in exploration allow for continued science operations at a cost far lower than developing a new mission.

Here is a summary of the NASA missions that have been extended.

Mars Odyssey — launched 2001

The Mars Odyssey orbiter will perform new thermal studies of rocks and ice below the planet’s surface, monitor the radiation environment, and continue its long-running climate monitoring campaign, NASA said. It will also continue to offer support for other Mars spacecraft.

MRO (Mars Reconnaissance Orbiter) — launched 2005

In its sixth extended mission, the MRO orbiter will study the evolution of Mars’ surface, ices, active geology, and atmosphere and climate, and carry on supporting other Mars missions.

New Horizons — launched 2006

The New Horizons probe zipped by Pluto in 2015 and the Kuiper belt object (KBO) Arrokoth in 2019. In its second extended mission, the spacecraft will continue to explore the distant solar system, with additional details of its mission coming at a later date.

LRO (Lunar Reconnaissance Orbiter) – launched 2009

NASA’s lunar orbiter has been cleared to continue studying the surface and geology of the moon. “The evolution of LRO’s orbit will allow it to study new regions away from the poles in unprecedented detail, including the Permanently Shadowed Regions (PSRs) near the poles where water ice may be found,” the space agency said. It added that LRO will also provide important support for NASA’s efforts to return humans to the moon in the next few years.

MSL (Mars Science Laboratory) — launched 2011

The MSL and its Curiosity rover have so far driven more than 16 miles (27 kilometers) across the surface of Mars, exploring the Gale Crater. This is the fourth time for MSL’s mission to be extended, and on this occasion it will set about climbing to higher elevations on the red planet in an effort to gain unique insights into the history of water on Mars.

MAVEN (Mars Atmosphere and Volatile Evolution) — launched 2013

The MAVEN spacecraft has been studying the loss of the red planet’s gasses to space. As the sun’s activity level increases toward the maximum of its 11-year cycle, MAVEN’s ongoing observations will “deepen our understanding of how Mars’ upper atmosphere and magnetic field interact with the sun,” NASA said.

OSIRIS-APEX (Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer) — launched 2016

The OSIRIS-REx mission is at this very moment heading back to Earth to drop off the samples of asteroid Bennu that it collected in 2020. After completing its special delivery in 2023, the mission will be renamed OSIRIS-APEX as the spacecraft is redirected to attempt a close study of Apophis, an asteroid 1,200 feet (about 370 meters) in diameter that will come within 20,000 miles (32,000 kilometers) of Earth in 2029.

InSight (Interior Exploration using Seismic Investigations, Geodesy, and Heat Transport) — launched 2018

NASA’s InSight lander has been performing the only active seismic station beyond Earth. Its seismic monitoring of “marsquakes” has provided provided scientists with data on Mars’ interior, formation, and current activity, with the mission set to continue this work.

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