Find the distance between the points (4,7) and (-3,7

Ascientist is explaining how background cosmic radiation gives evidence of the big bang theory. she says that radiation has been detected everywhere equally as heat in the universe and is increasing. this has been shown to be residual radiation from the big bang. what error did the scientist make?

Mengapakah wujudnya perbezaan tanggapan terhadap sumber?

The orbits of planets around the sun are slightly? or oval shaped?