Visitors explore NASA’s hands-on exhibits during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Travelers walk past NASA's exhibits at the Earth Day event held at Union Station on Monday, April 22, 2019, Washington, D.C. Photo Credit: (NASA/Joel Kowsky)

Dr. Michael Freilich, director, Earth Science Division, NASA Headquarters, speaks about the benefits of studying the Earth at NASA's Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Visitors explore NASA’s hands-on exhibits during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Students learn about the different regions of the Moon at one of NASA's exhibits at the Earth Day event on Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)

Visitors explore one of NASA's exhibits at the Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Visitors explore NASA's exhibits at the Earth Day event on Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)

Earth Science Division Deputy Director Julie Robinson speaks with local students during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

NASA Administrator Bill Nelson, right, visits NASA’s exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Bill Nelson, right, talks with Heather Hanson from NASA’s Goddard Space Flight Center about Earth Day and the interactive exhibits NASA has featured inside Union Station in Washington, Friday, April 22, 2022. Photo Credit: (NASA/Bill Ingalls)

Former NASA Administrator Charlie Bolden speaks with local students during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

A visitor explores one of NASA's exhibits at the Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

A visitor learns about Earth at one of NASA's exhibits at the Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

A view of the exhibits at NASA's Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

Students watch a short video on NASA's ICESat-2 at one of NASA's exhibits at the Earth Day event on Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)

Visitors look through virtual reality goggles at one of NASA's exhibits at the Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

A visitor looks through virtual reality viewers at one of NASA's exhibits at the Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Visitors view samples of different types of algae at one of NASA's exhibits at the Earth Day event on Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)

Some young visitors are seen at one of NASA's exhibits at the Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Visitors view satellite images of Earth at one of NASA's exhibits at the Earth Day event on Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)

A view of the exhibits at NASA's Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

Dr. Allison Leidner, scientist, Earth Science Division, NASA Headquarters, speaks about Earth’s biodiversity at NASA's Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Former NASA Administrator Charlie Bolden speaks with local students during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Visitors explore NASA’s hands-on exhibits during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Visitors pose for a photo with former NASA astronaut Paul Richards at the Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Visitors explore NASA’s hands-on exhibits during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Former NASA astronaut, Paul Richards, speaks about his experience viewing Earth from space at NASA's Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Dr. Michael Freilich, director, Earth Science Division, NASA Headquarters, speaks about the benefits of studying the Earth at NASA's Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Visitors explore one of NASA's exhibits at the Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Students create a cloud in a bottle at one of NASA's exhibits at the Earth Day event on Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)

Visitors explore NASA’s hands-on exhibits during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

A visitor looks through virtual reality viewers at one of NASA's exhibits at the Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

Visitors explore one of NASA's exhibits at the Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Visitors explore NASA's exhibits at the Earth Day event on Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)

Visitors learn about CubeSats at of NASA's exhibits at the Earth Day event on Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)

Visitors explore NASA’s hands-on exhibits during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

NASA Administrator Bill Nelson, left, talks with DC area school children about Earth Day during his visit of NASA hands-on exhibits inside Union Station in Washington, Friday, April 22, 2022. Photo Credit: (NASA/Bill Ingalls)

Visitors explore one of NASA's exhibits at the Earth Day event on Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

Former NASA astronaut, Paul Richards, speaks about his experience viewing Earth from space at NASA's Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

Visitors explore NASA’s hands-on exhibits during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Beads treated to react to ultraviolet light are used to show how the Sun's invisible rays can effect us at one of NASA's exhibits at the Earth Day event on Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

Former NASA Administrator Charlie Bolden speaks with local students during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

Visitors explore one of NASA's exhibits at the Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Visitors explore NASA’s hands-on exhibits during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Visitors explore NASA’s hands-on exhibits during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Former NASA Administrator Charlie Bolden speaks with local students during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

NASA Administrator Bill Nelson, center, joins with other NASA colleagues in recognizing Earth Day at one of many NASA exhibits at Union Station in Washington, Friday, April 22, 2022. Photo Credit: (NASA/Bill Ingalls)

A visitor gives a high five after learning about oceans at one of NASA's exhibits at the Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Visitors explore one of NASA's exhibits at the Earth Day event on Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)

Visitors explore NASA’s hands-on exhibits during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Earth Science Division Deputy Director Julie Robinson speaks with local students during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Visitors to NASA's exhibits at the Earth Day event take a picture with a globe, Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)

Visitors learn how satellites monitor the water cycle at one of NASA's exhibits at the Earth Day event on Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)

Visitors explore NASA’s hands-on exhibits during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

NASA Administrator Bill Nelson, left, talks with NASA team members about Earth Day during his tour of NASA hands-on exhibits inside Union Station in Washington, Friday, April 22, 2022. Photo Credit: (NASA/Bill Ingalls)

Former NASA Administrator Charlie Bolden speaks with local students during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Former NASA Administrator Charlie Bolden speaks with local students during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Visitors explore NASA's exhibits at the Earth Day event on Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)

Visitors explore NASA’s hands-on exhibits during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Earth Science Division Deputy Director Julie Robinson speaks with local students during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Visitors explore one of NASA's exhibits at the Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Visitors explore NASA’s hands-on exhibits during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

Former NASA Administrator Charlie Bolden speaks with local students during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

Former NASA Administrator Charlie Bolden speaks with local students during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Visitors explore one of NASA's exhibits at the Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Visitors explore NASA’s hands-on exhibits during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Former NASA Administrator Charlie Bolden speaks with local students during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

Visitors explore NASA’s hands-on exhibits during Earth Day, Friday, April 22, 2022, at Union Station in Washington. Photo Credit: (NASA/Bill Ingalls)

Visitors explore NASA’s hands-on exhibits during an Earth Day event, Thursday, April 20, 2023, at Union Station in Washington. Photo Credit: (NASA/Keegan Barber)

A visitor explores one of NASA's exhibits at the Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)

Signs that can be held up in a picture with a large globe are seen on a table at NASA's Earth Day event on Monday, April 22, 2019, at Union Station in Washington, D.C. Photo Credit: (NASA/Joel Kowsky)