What is Earth's distance from the Sun?
a. 0.39 AU
b. 0.72 AU
c. 1.0 AU
d. 1.5 AU
e. 2.8 AU
c
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At least 50 percent of the stars in the Orion nebula are encircled by dense disks of gas and dust with more than enough mass to make planetary systems like ours
Indicate whether the statement is true or false
Which of the following properties of the planets in our solar system is NOT explained by condensation theory?
A) direction of revolution B) rotation rates C) chemical compositions D) orbital shapes
Which one of the following processes of heat transfer requires the presence of a fluid?
a. conduction b. radiation c. convection d. none of the above choices are valid
The Z0 boson is a mediator of weak interactions. It mass is 93 GeV/c2. About what is the range of this weak interaction?
A. 10-15m B. 10-18m C. 10-21m D. 10-24m E. 10-27m