ALT “Earth Day” is spelled out by satellite views of Earth features in the middle of the image. The “letters” are colorful, represented by views of water and land in shades of blue, brown, green, and even red. Underneath are the words “Earth Day” and “Celebrate Earth from space with NASA.” The “day” is written in a vibrant blue, while the rest of the words are white. The background of the poster is black. “National Aeronautics and Space Administration” is written at top left, “nasa.gov” is written at bottom left, and the NASA “meatball” logo appears at top right in black and white. Credit: NASA/USGS

ALT An illustration with four panels of colorful images, each with science-related themes. The top four panels each contain a word: from left to right, "Science," "Technology," "Engineering," and "Math." Between the two rows of panels is the NASA meatball insignia and a NASAEXPRESS logo, followed by the text "Your STEM Connection." At the bottom row, text reads "Subscribe - get NASA EXPRESS in your inbox." Credit: NASA