Some scientists speculate that super-Earths and water worlds might be habitable at greater distances from their stars than Earth-size planets. Why?
A) Their larger sizes might allow them to retain hydrogen atmospheres.
B) Their larger sizes mean they might have more of the ingredients needed for life.
C) For the water worlds, at least, they are certain to have oceans no matter how far they are from a star.
D) These planets may retain more internal heat than Earth, which might drive greater geological activity.
A) Their larger sizes might allow them to retain hydrogen atmospheres.
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Even if societies on stars in distant galaxies survive at a technological level for only 10 years, that is long enough to establish two-way communication with them
Indicate whether the statement is true or false
A spaceship moving past the Earth with a speed of 0.800c signals to the Earth with pulsed laser photons emitted at 10.0-second intervals according to the spaceship's clock. According to observers on Earth who see the flashes, the time interval they measure is
A. 13.4 s B. 16.7 s C. 12.5 s D. 9.70 s E. 6.03 s
How did discovering the KBOs demote Pluto's planetary status?
What will be an ideal response?
A concrete wall is 15.0 cm thick and has an area of 10.0 m2. A layer of wood that is 2.50 cm thick is placed over the wall to reduce the loss of heat by thermal conduction. The coefficient thermal conductivity of concrete is 1.70 W/m 
and the coefficient of thermal conductivity of wood is 0.0400 W/m 
What is the effective coefficient of thermal conductivity of the wood on concrete system?
A. 0.245 W/m 
B. 1.22 W/m
C. 1.65 W/m
D. 2.02 W/m
E. 2.34 W/m