are convergent lines.
Intersecting lines
convergent
Two or more lines meeting at a common point are called intersecting lines.
Yes. If the star is moving away from the Earth, its spectral lines will shift towards the red end of the spectrum. If it is moving towards the Earth, its spectral lines will shift towards the violet end of the spectrum. This is due to Doppler effect.
The spectral lines move towards one direction, or towards the other direction, depending on the relative speed.
They will be blueshifted, that is their wavelengths will be shortened and their frequencies increased.
Divergent and convergent are both boundaries that form different kinds of landmasses.
Minimum and maximum requirements: three straight lines meeting pairwise. Minimum and maximum requirements: three straight lines meeting pairwise. Minimum and maximum requirements: three straight lines meeting pairwise. Minimum and maximum requirements: three straight lines meeting pairwise.
Astronomers use the Doppler effect to determine if a star is moving towards or away from us. By observing the shift in the star's spectral lines towards the blue end of the spectrum (blueshift) or the red end of the spectrum (redshift), astronomers can infer the star's motion relative to Earth. Blueshift indicates the star is moving towards us, while redshift indicates it is moving away from us.
Intersection.
They both cross paths. Intersecting lines can cross paths in any ways, but perpendicular lines have to cross at 90 degrees.
Eight straight lines, meeting in pairs at eight vertices.