The Artemis II crew, NASA astronauts Victor Glover, Reid Wiseman, and Christina Koch, and Canadian Space Agency (CSA) astronaut Jeremy Hansen, pose for a photo after a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

Artemis II Commander, NASA astronaut Reid Wiseman provides remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

Artemis II Commander, NASA astronaut Reid Wiseman provides remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

Director of the Capitol Grounds and Arboretum, Jim Kaufmann, provides welcome remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

U.S. Rep. Harold “Hal” Rogers (R-KY) provides remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

Artemis II Commander, NASA astronaut Reid Wiseman provides remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

Artemis II astronaut Victor Glover greets U.S. Rep. Matt Cartwright (D-PA) at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

U.S. Rep. Frank Lucas (R-OK) provides remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

NASA Deputy Administrator Pam Melroy provides remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

NASA Deputy Administrator Pam Melroy provides remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

U.S. Rep. Frank Lucas (R-OK) provides remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

Artemis II Commander, NASA astronaut Reid Wiseman provides remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

NASA Deputy Administrator Pam Melroy provides remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

U.S. Rep. Matt Cartwright (D-PA) provides remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

Artemis II Commander, NASA astronaut Reid Wiseman provides remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

Minister, Congressional, Public and Intergovernmental Affairs, Embassy of Canada, Carrie Goodge O'Brien, provides remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

NASA Deputy Administrator Pam Melroy provides remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

Minister, Congressional, Public and Intergovernmental Affairs, Embassy of Canada, Carrie Goodge O'Brien, provides remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

Artemis II Commander, NASA astronaut Reid Wiseman provides remarks at a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

An American Sweetgum sapling grown from a seed that was flown around the Moon during the Artemis I mission is seen before a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. Photo Credit: (NASA/Aubrey Gemignani)

The leaves of an American Sweetgum sapling grown from a seed that was flown around the Moon during the Artemis I mission is seen before a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. Photo Credit: (NASA/Aubrey Gemignani)

An American Sweetgum sapling grown from a seed that was flown around the Moon during the Artemis I mission is seen before a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. Photo Credit: (NASA/Aubrey Gemignani)

The "Moon Tree" in front of the Visitor Center at NASA's Goddard Space Flight Center in Greenbelt, Md. This sycamore was planted at the visitor center on June 9, 1977, and grew from a seed carried to the Moon aboard Apollo 14.

The "Moon Tree" in front of the Visitor Center at NASA's Goddard Space Flight Center in Greenbelt, Md. This sycamore was planted at the visitor center on June 9, 1977, and grew from a seed carried to the Moon aboard Apollo 14.

From left to right, Artemis II crew members, NASA astronauts Victor Glover and Reid Wiseman, NASA Associate Administrator, Office of STEM Engagement, Mike Kincaid, NASA Deputy Associate Administrator Casey Swails, NASA Deputy Administrator Pam Melroy, and Artemis II crew members NASA astronaut Christina Koch and Canadian Space Agency (CSA) astronaut Jeremy Hansen, pose for a photo after a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

From left to right, U.S. Rep. Matt Cartwright (D-PA), Artemis II crew members, NASA astronauts Victor Glover and Reid Wiseman, U.S. Rep. Frank Lucas (R-OK), U.S. Rep. Harold “Hal” Rogers (R-KY), Artemis II crew members NASA astronaut Christina Koch and Canadian Space Agency (CSA) astronaut Jeremy Hansen, U.S. Rep. Charles Albert "Dutch" Ruppersberger III (D-MD), NASA Deputy Administrator Pam Melroy, and Minister, Congressional, Public, and Intergovernmental Affairs, Embassy of Canada, Carrie Goodge O'Brien, pose for a photo after a Moon tree dedication ceremony, Tuesday, June 4, 2024 at the United States Capitol in Washington. The American Sweetgum tree planted on the southwestern side of the Capitol, was grown from a seed that was flown around the Moon during the Artemis I mission. Photo Credit: (NASA/Aubrey Gemignani)

CAPE CANAVERAL, Fla. – A group of trees and bushes provides a frame for the launch of the United Launch Alliance Delta II Heavy rocket carrying NASA’s twin Gravity Recovery and Interior Laboratory (GRAIL) mission off Space Launch Complex 17B on Cape Canaveral Air Force Station in Florida. The spacecraft launched at 9:08:52 a.m. EDT Sept. 10. GRAIL-A will separate from the second stage of the rocket at about one hour, 21 minutes after liftoff, followed by GRAIL-B at 90 minutes after launch. The spacecraft are embarking on a three-month journey to reach the moon. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/George Roberts

CAPE CANAVERAL, Fla. – Over a group of trees and bushes, the United Launch Alliance Delta II Heavy rocket carrying NASA’s twin Gravity Recovery and Interior Laboratory (GRAIL) mission launches off Space Launch Complex 17B on Cape Canaveral Air Force Station in Florida. The spacecraft launched at 9:08:52 a.m. EDT Sept. 10. GRAIL-A will separate from the second stage of the rocket at about one hour, 21 minutes after liftoff, followed by GRAIL-B at 90 minutes after launch. The spacecraft are embarking on a three-month journey to reach the moon. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/George Roberts

CAPE CANAVERAL, Fla. – Over a group of trees and bushes, the United Launch Alliance Delta II Heavy rocket carrying NASA’s twin Gravity Recovery and Interior Laboratory (GRAIL) mission launches off Space Launch Complex 17B on Cape Canaveral Air Force Station in Florida. At left is the pad’s mobile service tower. The spacecraft launched at 9:08:52 a.m. EDT Sept. 10. GRAIL-A will separate from the second stage of the rocket at about one hour, 21 minutes after liftoff, followed by GRAIL-B at 90 minutes after launch. The spacecraft are embarking on a three-month journey to reach the moon. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kenny Allen

CAPE CANAVERAL, Fla. – Over a group of trees and bushes, the United Launch Alliance Delta II Heavy rocket carrying NASA’s twin Gravity Recovery and Interior Laboratory (GRAIL) mission launches off Space Launch Complex 17B on Cape Canaveral Air Force Station in Florida. At left is the pad’s mobile service tower. The spacecraft launched at 9:08:52 a.m. EDT Sept. 10. GRAIL-A will separate from the second stage of the rocket at about one hour, 21 minutes after liftoff, followed by GRAIL-B at 90 minutes after launch. The spacecraft are embarking on a three-month journey to reach the moon. GRAIL will fly twin spacecraft in tandem around the moon to precisely measure and map variations in the moon's gravitational field. The mission will provide the most accurate global gravity field to date for any planet, including Earth. This detailed information will reveal differences in the density of the moon's crust and mantle and will help answer fundamental questions about the moon's internal structure, thermal evolution, and history of collisions with asteroids. The aim is to map the moon's gravity field so completely that future moon vehicles can safely navigate anywhere on the moon’s surface. For more information, visit http://www.nasa.gov/grail. Photo credit: NASA/Kenny Allen