At just 25, Cecilia Payne-Gaposchkin applied quantum physics to a treasure trove of astronomical observations to show that stars are mostly hydrogen and helium.

The Post welcomes letters up to 250 words on topics of general interest. Letters must include full name, home address, day and evening phone numbers, and may be edited for length, grammar and accuracy ...

Get a great machine for cheap with our top-rated picks for budget laptops all costing $1,000 or less.