Emission nebula appear red because they are associated with cool red giant stars
Indicate whether the statement is true or false
FALSE
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How does gravitational lensing let us find massive dark objects?
What will be an ideal response?
The most geologically active moon in our solar system is Ganymede
Indicate whether the statement is true or false
It is often stated that natural systems are capable of cleaning pollution (at least when the contamination is not large). How can plants and animals in the environment clean water?
What will be an ideal response?
The density of water at 0°C is 999.84 kg/m3 and at 4°C it is 999.96 kg/m3. A 1.0-L container, full to the brim with water at 4.0°C is placed in the refrigerator
By the time that the temperature of the water reaches 0.0°C, what volume of water has spilled from the container, assuming that the contraction of the container is negligible? A) 1.1 × 10-7 m3 B) 1.2 × 10-7 m3 C) 1.3 × 10-7 m3 D) 1.4 × 10-7 m3 E) 1.5 × 10-7 m3