We spent a lot of time at Yeshiva discussing when a Jew in space, or on Mars, or on a planet orbiting Alpha Centauri (for example) would have to light Shabbos c

We spent a lot of time at Yeshiva discussing when a Jew in space, or on Mars, or on a planet orbiting Alpha Centauri (for example) would have to light Shabbos candles or celebrate Yom Kippur. This issue has already come up with Jewish astronauts on the Space Station.