Solar System Scale Model Classroom Poster

Design a high-quality, visually engaging classroom poster illustrating the solar system with accurate scale distances between planets. The poster should be:

1. Bright and colorfully rendered to capture the attention of elementary school students aged 7-10.
2. Clearly labeled with the names of all eight planets—Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune—in an easy-to-read font.
3. Proportional in size, representing the actual distances between planets to a scale of 1:100 million. Use distinct colors for each planet to enhance visual recognition.
4. Framed with a thoughtfully designed border that complements the color scheme, giving the poster a professional appearance.
5. Containing informative captions that briefly describe each planet's characteristics, such as size, number of moons, or unique features like Jupiter's Great Red Spot.
6. Suitable for printing on a standard 24" x 36" poster board or a 32" x 48" poster board.

The primary goal of this poster is to serve as an educational aid in a science classroom, making complex planetary data accessible and engaging for young learners. Please ensure the design is:

• Uncluttered and free of extraneous elements
• Balanced in composition, with planets evenly spaced
• Easy to understand at a quick glance
• Compliant with copyright laws and free for educational use

Please output your design in a high-resolution PDF format, with a minimum resolution of 300 dpi, suitable for printing in a classroom environment. Provide a description of the color scheme and any other design choices that contribute to the poster's educational effectiveness.