The Local Group of galaxies spans about 30 million light-years in diameter.
Indicate whether the statement is true or false
Question 2
Energy balance in the Sun refers to a balance between ________.
A) the force of gravity pulling inward and the force due to pressure pushing outward
B) the amount of energy the Sun radiates into space and the amount of energy that reaches Earth
C) the rate at which fusion generates energy in the Sun's core and the rate at which the Sun's surface radiates energy into space
D) the mass that the Sun loses each second and the amount of mass converted into energy each second
Vertebral compression Fractures of the spine (vertebra) can cause severe ”band-like” pain that radia
Uranus revolves around the Sun once every 84 Earth years. Its average distance from the Sun is rough
Curved Spacetime and the Path of Light
Gravitational Lensing of Extremely Distant Galaxies
Ngandong calottes from Java are the youngest H. erectus fossils at perhaps 27,000-50,000 years old.
In the retina, there are two types of light receptor cells: Rods are sensitive to differences in lig