I wonder if when stars are closer... less than light years away from one another if space is still as cold as we know it to be here in the shade... In the eclipse of the earth or moon... in the shadows... or, is heat only available/present in direct light?
Pluto is 5,000 times closer to the sun than the nearest star. It’s less than 1/1000th of a light year from the sun. Yet it’s cold enough for nitrogen to freeze solid on its surface.
During a total solar eclipse street lights turn on and it becomes noticeably colder...