be on another planet
US /bi ɑn əˈnʌðər ˈplænɪt/
UK /bi ɑn əˈnʌðər ˈplænɪt/

1.
estar em outro planeta, estar no mundo da lua
to be unaware of what is happening around you, often because you are thinking about something else
:
•
He seems to be on another planet today, not paying attention to anything.
Ele parece estar em outro planeta hoje, não prestando atenção em nada.
•
When I tried to talk to her, she just stared blankly, like she was on another planet.
Quando tentei falar com ela, ela apenas olhou fixamente, como se estivesse em outro planeta.