Question

1. there are many galaxies and other celestial objects in our sky that are listed as having negative speeds (like -230 km/s, or -1,055 km/s). what do you think this means? why?

Explanation:

Step1: Define speed and direction

Speed is a scalar quantity, but in this context, negative values imply direction. In astronomy, positive speed is often defined as motion away from an observer, so negative speed means the celestial object is moving towards the observer.

Step2: Reason for negative speed

The negative - speed values for galaxies and celestial objects indicate that they are approaching the Earth (the observer). This could be due to gravitational interactions between the object and the Milky Way (where Earth is located), or relative velocities within a cluster or super - cluster of galaxies.

Answer:

The negative speeds of galaxies and other celestial objects mean that they are moving towards the observer (on Earth). This is because in the context of astronomy, negative speed is used to denote motion in the opposite direction of the defined positive direction (usually motion away from the observer).