Consider two future observatories in space. Observatory X consists of a single 50-metre telescope. Observatory Y is an interferometre consisting of five 10-metre telescopes, spread out over a region 100 metres across. Which observatory can detect dimmer stars, and which one can see more detail in its images

Which pair below describes isotopes of the same element? a) an atom with 6 protons and 8 neutrons - an atom with 8 protons and 6 neutrons b) an atom with 6 protons and 6 neutrons - an atom with 6 protons and 7 neutrons c) an atom with 8 protons and 8 neutrons - an atom with 7 protons and 8 neutrons d) an atom with 7 protons and 6 neutrons - an atom with 6 protons and 6 neutrons