__________are objects used to map spiral arms
A) Spiral locators
B) Spiral tracers
C) Arm finders
D) Spiral waves
B
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Chemical evolution concentrated the various smaller molecules into the more stable forms
Indicate whether the statement is true or false
Why is there a lower end in the main sequence of the H-R diagram?
What will be an ideal response?
Three objects experience interactions. Object A has mass, object B has electrical charge, and object C has both mass and electrical charge. Which of the following statements are true?
A. object A and object B experience an electrical interaction B. object A and object C experience a gravitational interaction C. object C experiences an electrical interaction with itself D. object A and object C experience an electrical interaction E. object A and object B experience a gravitational interaction
If Star A has a parallax angle of 3 arc seconds while Star B has a parallax angle of 9 arc seconds then we know that
A. Star A is nine times farther away. B. Star B is three times farther away. C. Star B is nine times farther away. D. Star A is three times farther away.