Are the planets proportionate? Sün forinstance?

They are somewhat proportionate as the image shows. The Sun is the largest and the other planets are some scaled version of themselves (the directions explain the scaled sizes). However, as another buyer said, the proportions are not as accurate as possible as the Sun would be giant and everything else minuscule. As this inflatable solar system is more for display or demonstrative purposes, it is a great start but not the exact scale replica that older scientists might want to look at. It was great fun for my 3rd grade students and a lovely addition to the classroom decor.

Can we use helium instead of air?

You can add Helium to them but they would be too heavy to float. They would probably leak, as well.

Are these flame-proof?

Hello, WARNING: Extreme temperatures above 70°F and below 0°F can cause damage to the inflatable plastic material. Do not store this inflatable product in direct sunlight for long periods of time. Please visit us on our Learning Resources site under the “contact us” page with any other questions you may have.

Product Dimensions	35.81 x 28.96 x 8.64 cm; 1.14 kg
Manufacturer recommended age	5 - 10 years
Item model number	LER2434
Educational Objective(s)	Learning Solar System and Astronomy Concepts
Language:	English
Number of Puzzle Pieces	13
Assembly Required	Yes
Batteries Required?	No
Batteries Included?	No
tech_spec_battery_description_toys	Nicht zutreffend
Material Type(s)	Plastic
Remote Control Included?	No
Radio Control Suitability	indoor
Color	Multicoloured
Release date	27 September 2013
ASIN	B0006PJ104

Inflatable Solar System Set

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