Yes they are invisible from Earth, but dont take my words for go to NASA or ESA .and they well guaranty answer your question, thank you very much for your interest in Science and Astronomy Ciao.
Donatello2030 1 month ago
@donatello2030 sir? is black hole real?
TheMetaloyds 2 months ago
@TheMetaloyds of corse it is real.
THEUNKNOWNWANDEREMAN 1 month ago
excellent and informative. those quasars are impressive and unbelievable. very nice coupling of visuals and sound.
wp4866 4 months ago 2
@wp4866 Thank you for your generous comment Ciao.
Donatello2030 3 months ago
Yes they are invisible from Earth, but dont take my words for go to NASA or ESA .and they well guaranty answer your question, thank you very much for your interest in Science and Astronomy Ciao.
Donatello2030 1 month ago
@donatello2030 sir? is black hole real?
TheMetaloyds 2 months ago
@TheMetaloyds of corse it is real.
THEUNKNOWNWANDEREMAN 1 month ago
excellent and informative. those quasars are impressive and unbelievable. very nice coupling of visuals and sound.
wp4866 4 months ago 2
@wp4866 Thank you for your generous comment Ciao.
Donatello2030 3 months ago