The dense disks of gas and dust such as those seen around the stars in Orion are sites where planets could be forming right now
a. True
b. False
Indicate whether the statement is true or false
True
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Why don't we see the constellation Orion all year?
a) As the Earth orbits the Sun, its nighttime side points to different constellationsat different points along its orbit. b) It is frequently eclipsed by the Moon. c) When we are close to Orion it appears bright, but when we are far away it gets toofaint to see. d) Half the year it is visible in North America, and the other half in SouthAmerica. e) It is not along the Ecliptic path and only the constellations of the Zodiac are visibleall year round.
A satellite of mass m1 circles a planet of mass m2 and radius r in an orbit at a height 2r above the surface of the planet. What minimum energy is required to change the orbit to one for which the height of the satellite is 3r above the surface of the planet?
A.
B.
C.
D.
E.
Ionized helium lines are found in both type B and O stars
Indicate whether the statement is true or false
Neptune circles the Sun at a distance of 4.50 × 1012 m once every 164 years. Saturn circles the Sun at a distance of 1.43 × 1012 m. What is the orbital period of Saturn?
A) 304 years B) 121 years C) 109 years D) 88.6 years E) 29.4 years