Science & Technology

NASA Selects Mission Proposals to Study Stellar Explosions, Galaxies & Stars

Animation showing the formation of a supernova remnant.

Four mission proposals submitted to NASA’s Explorers Program have been selected for further study. The proposals include missions that would study exploding stars, distant clusters of galaxies, as well as nearby galaxies and stars.

Two Explorer Missions of Opportunity and two Astrophysics Medium Explorer missions have been selected to conduct mission concept studies. In 2024, after a detailed evaluation of these studies, NASA plans to select one Mission of Opportunity and one Medium Explorer to proceed with implementation. The selected missions will be targeted for launch in 2027 and 2028, respectively.

“NASA’s Explorers Program has a proud tradition of supporting innovative approaches to exceptional science, and these selections hold that same promise,” said Thomas Zurbuchen, associate administrator for NASA’s Science Mission Directorate at NASA Headquarters in Washington. “From studying the evolution of galaxies to explosive, high-energy events, these proposals are inspiring in their scope and creativity to explore the unknown in our universe.”

This image from NASA’s Hubble Space Telescope features the spiral galaxy Mrk (Markarian) 1337, which is roughly 120 million light-years away from Earth in the constellation Virgo. Credit: ESA/Hubble & NASA, A. Riess et al.

NASA Explorer missions conduct focused scientific investigations and develop instruments that fill scientific gaps between the agency’s larger space science missions. The proposals were competitively selected based on the potential science value and feasibility of development plans.

Each of the two Medium Explorer teams selected at this stage will receive $3 million to conduct a nine-month mission concept study. Astrophysics Medium Explorer mission costs are capped at $300 million each, excluding the launch vehicle. The selected proposals are:

UltraViolet EXplorer (UVEX)

Survey and Time-domain Astrophysical Research Explorer (STAR-X)

Each of the two Mission of Opportunity teams selected at this stage will receive $750,000 to conduct a nine-month implementation concept study. NASA Mission of Opportunity costs are capped at $80 million each. The selected proposals are:

Moon Burst Energetics All-sky Monitor (MoonBEAM)

A LargE Area burst Polarimeter (LEAP)

The Explorers Program is the oldest continuous NASA program. The program is designed to provide frequent, low-cost access to space using principal investigator-led space science investigations relevant to the Science Mission Directorate’s astrophysics and heliophysics programs.

Since the launch of Explorer 1 in 1958, which discovered the Earth’s radiation belts, the Explorers Program has launched more than 90 missions, including the Uhuru and Cosmic Background Explorer (COBE) missions that led to Nobel prizes for their investigators.

The program is managed by NASA Goddard for NASA’s Science Mission Directorate in Washington, which conducts a wide variety of research and scientific exploration programs for Earth studies, space weather, the solar system, and the universe.

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