Meditating on scripture

The Bible tells us to meditate on the word and sometimes a passage stands out to us and we just don’t know what it means. That was the case when I read Mark 13:27

Mark 13:27
New International Version (NIV)
And he will send his angels and gather his elect from the four winds, from the ends of the earth to the ends of the heavens.from Bible Gateway

So I’m curious to know what they mean with “to the ends of the heavens”.

Will be worth reading it in context though, but if anybody has some thoughts let me know.