1. what is the study of the cosmos? the study of the cosmos includes what topics? 2. how do astronomers think the universe was created? 3. what evidence is there to support the big bang theory? 4. how is matter distributed within the universe? 5. what are galaxies? why is it important to study them? 1. how are stars important to the milky way? 2. how has the knowledge and perception of the universe changed over the past century? 3. what effect does dark energy have on the universe? 4. how is matter important to the universe? 5. what do scientists believe may be the fate of the universe? which theory do you feel is the better explanation of what may happen? why?

1. Physical cosmology  branch of physics and astrophysics that deals with the study of the physical origins and evolution  of the Universe
2. The big bang theory
3. Radiation
4. Main proof is the red shift of Galaxies and the cosmic micro Wave back ground radiation.
5.a highly structured fashion

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    m₁v₁ + m₂v₂ = (m₁ + m₂)vmomentum is conserved.the left-hand side of the equation represents the momentum in the system before the collision.the right-hand side represents the momentum in the system after the collisionm₁ and v₁ represents the mass and the velocity of the physics blockm₂ and v₂ represents the mass and velocity of the ball of puttyv represents the final velocity of the combined mass.the question states the two masses stick together. they combined mass has its own velocity with the body mass the sum of the two objects' massestheir combined momentum is (m₁ + m₂)vto find the magitude of (m₁ + m₂)v, we need to add the vectors on the left-hand side of the equation: m₁v₁ + m₂v₂.note the diagram. i have positioned the vectors in accordance with their directions.the magnitude of the resultant can be calculated using the pythagorean theorem since this is a right triangle situation (north and west are perpendicular)|(m₁ + m₂)v| =  √[ (m₁v₁)² + (m₂v₂)² ]|(m₁ + m₂)v| =  √[ (1.5kg·8.0m/s)² + (0.40kg·20m/s)² ]|(m₁ + m₂)v| =  14.4 kg m/sfor two significant figures (assuming that 20m/s is two), this rounds to 14 kg m/s