AST201H1 Lecture 4: AST201- Lecture 4

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST201H1
• Professor: Bryan Gaensler

Document Summary

Figure 2 (credit: prof. gaensler: gravity, from 1687-1916, ne(cid:449)to(cid:374)"s description of gravity changed time to time. Re(cid:373)e(cid:373)(cid:271)er (cid:449)he(cid:374) you (cid:449)ere asked of ho(cid:449) you k(cid:374)o(cid:449) if you"re (cid:373)o(cid:448)i(cid:374)g: we (cid:272)a(cid:373)e to the (cid:272)o(cid:374)(cid:272)lusio(cid:374) that you (cid:272)a(cid:374)"t k(cid:374)o(cid:449), i(cid:374) a(cid:374) a(cid:271)solute se(cid:374)se, einstein asked, ho(cid:449) do (cid:449)e k(cid:374)o(cid:449) if (cid:449)e"re feeli(cid:374)g the for(cid:272)e of gra(cid:448)ity. Figure 3(credit: time travel research center: states that no experiment can tell a gravitational force from a corresponding acceleration of the whole reference frame, einstein realized that equivalence of acceleration and gravity had many implications. Figure 6 (credit:nick strobel: but equivalence principle says that gravity and acceleration are equivalent and indistinguishable if acceleration bends light, gravity must bend light too. Bending light if einstein is right, starlight should bend around the sun. Figure 10 (credit: prof. ganseler: do stars just behind the edge of sun shift slightly in their positions by the amount. Space tells matter how to move: general relativity replaces force of gravity.