Task: Text Simplification
Input (English): reflection nebulae are usually blue because the scattering is more efficient for blue light than red -lrb- this is the same scattering process that gives us blue skies and red sunsets -rrb-.
Output (English): reflection nebulae -lrb- a cloud of gas and dust in outer space -rrb- are usually blue because the random spreading in various directions is more capable for blue light than red -lrb- this is the same spreading process that gives us blue skies and red sunsets -rrb-.