Because we live in an expanding universe, distant galaxies are farther away from us today than they were when the light we see from them started on its journey to us. so what do we mean when we say that a galaxy is 7 billion light-years away?

Why does a tidal bulge occurs on opposote sides of earth

Which part of a mountain receives the majority of moisture due to the rain shadow effect? a. the leeward side b. the windward side c. the bottom of the mountain d. all parts of the mountain receive equal amounts of moisture.

The incident command system (ics) is: a. most applicable to the management of complex incidents that extend over many hours or days. b. a military system used in domestic incidents to ensure command and control of federal resources. c. a standardized management tool for meeting the demands of small or large emergency or nonemergency situations. d. a relatively new approach created based on the lessons learned from hurricane harvey disaster operations.