A tale based on an Arab legend. The stars in the sky ...
A tale based on an Arab legend. The stars in the sky vary in brightness. There can be many reasons for this based on processes going on inside the star or around it. The star in this story is an eclipsing binary star.
Build a realistic model of the Earth using sunlight as a reference ...
Build a realistic model of the Earth using sunlight as a reference to understand phenomena related to the position of the Earth with respect to the Sun.
No restrictions on your remixing, redistributing, or making derivative works. Give credit to the author, as required.
Your remixing, redistributing, or making derivatives works comes with some restrictions, including how it is shared.
Your redistributing comes with some restrictions. Do not remix or make derivative works.
Most restrictive license type. Prohibits most uses, sharing, and any changes.
Copyrighted materials, available under Fair Use and the TEACH Act for US-based educators, or other custom arrangements. Go to the resource provider to see their individual restrictions.
