scientists at solar College in Pennsylvania made the finding . They detected X - ray emissions consistent with thousands of white stars . These are stars left behind after larger planets use up their fuel . But why thousands of these stars are there remains a mystery .
Scientists at Haverford College in Pennsylvania made the finding . They spotted X-ray emissions consistent with thousands of white dwarfs . These are stars left behind after larger ones use up their fuel . But why thousands of these stars are there remains a mystery .