Why would the Silver Age Superman be careful of his space-routes?

[Uncle Mxy]

well in the last issue of Action supes is said to gain new powers under a blue sun

In a recent Brave & Bold, Supergirl is 3x as powerful because she's in a trinary solar system. 

[jimmy-neutron]

>>well in the last issue of Action supes is said to gain new powers under a blue >>sun

>In a recent Brave & Bold, Supergirl is 3x as powerful because she's in a trinary >solar system.
Was going to suggest if Superman had ever encountered a "black sun", though (on a more scientific basis) has Superman even dared to go near a black hole? 

[carmine]

How close does Superman have to be to a red son for it to have an effect on him???
or how far away from a yellow sun can supes be and still get powered from it???

It seems to me (and I am no expert) that Superman gets all his powers "turned on" as soon as he is near a yellow sun and his powers will "stay on" forever unless he gets "near" a red sun. (by near I mean with in the that sun's solar system. which isn't that "near" at all really)

[MatterEaterLad]

How close does Superman have to be to a red son for it to have an effect on him???
or how far away from a yellow sun can supes be and still get powered from it???

It seems to me (and I am no expert) that Superman gets all his powers "turned on" as soon as he is near a yellow sun and his powers will "stay on" forever unless he gets "near" a red sun. (by near I mean with in the that sun's solar system. which isn't that "near" at all really)

Yeah, that's one of the things that never got explained too well. One story from the middle 1960s had the Galactic Thief Masters projecting a yellow sun onto a red sun, when they turned the projector off, Supes dropped like a rock onto a planet.

Comics science is a twisty road leading nowhere, not that it isn't fun...