Letters to the Editor

Readers ask about exoplanet heating sources, combating climate change and COVID-19

Readers ask about the size of the Milky Way, ancient rainforests and COVID-19

Readers ask about dust in space, playgrounds, and COVID-19

Readers ask about satellite traffic jams and coronavirus

Readers ask about bat viruses and coronavirus

Readers ask about coronavirus, and weigh in on climate change coverage

Readers weigh in on coronavirus, cats and more

Readers comment on TB vaccines and more

Readers respond to Notre Dame’s uncertain future

Readers had questions about Notre Dame cathedral, memory and more

Readers were curious about a new depression drug and more

Readers had questions about ketamine, bourbon, a universal mystery and more.

Readers comment on penguin sex, math and more

Readers react to rechargeable batteries and more

Readers had questions about lithium-ion batteries.