Well I don't think one can blame the Sahabi (RA) here. If indeed the question was about throwing sun and moon into the hell, Muslims believe there is hell eventhough we do not know how exactly it will be. So the eeman of that Sahabi (RA) made him react like that. When Allah SWT can make hell, He SWT can throw sun, moon or anything of giant size inside in that. We can't sit and imagine how it is possible and that is why he RA reprimanded the questioner I think. Allahu alam Once our beloved Prophet SAW was narrating something to the companians (RA) and at that time Abu Bakr Siddeeque (RA) and Umar (RA) were not present. The Prophet SAW mentioned about wolves or some animals talking, one of the sahabahs (RA) wondered like, "A wolf talking?" Hearing this, the Prophet SAW said that if Abu Bakr Siddeeque (RA) and Umar (RA) were present here, they would have plainly believed and thus appreciated their eemaan. Same can be said about the night journey of the Prophet SAW. Today we say it takes billions of light years to reach a particular galaxy in the universe. When Prophet SAW told he SAW travelled to the heavens in a night and came back in the same night, Abu Bakr Siddeeque (RA) belived his SAW words straight away. That is the eemaan. The companions (RA) didnt ask how he SAW could travel and even we believe for we know nothing is impossible for Allah SWT for He SWT is the All able and powerful. Allahu alam