Cecilia Payne-Gaposchkin discovered that stars are mostly made of hydrogen

Have you ever wondered why stars shine? When you gaze up at the night sky and observe the twinkling shapes, or bask in the warmth of the sun on a hot afternoon, have you pondered the source of that l… [+9593 chars]

Cecilia Payne-Gaposchkin discovered that stars are mostly made of hydrogen

Cecilia Payne-Gaposchkin discovered that stars are mostly made of hydrogen

Cecilia Payne-Gaposchkin discovered that stars are mostly made of hydrogen

Cecilia Payne-Gaposchkin discovered that stars are mostly made of hydrogen

Cecilia Payne-Gaposchkin discovered that stars are mostly made of hydrogen