Stars are only points of light in the sky. we cannot see how big they are, nor any surface features that might indicate they are sun-like. discuss the many observations that we can make that tell us what stars are. these observations might include distance, various color and spectrum measurements, orbital measurements of binary stars, and/or stellar eclipses, among others. the fundamental properties of stars as observable objects are mass, radius, luminosity, surface temperature, element composition, and rotation, as well as distance. how do we determine these properties?

Gold is not now being extracted from seawater. why not? a. it would be too disruptive to marine life to develop any marine mineral resources b. there is no gold in seawater c. we don't know how to extract minerals from seawater d. it would be too costly and difficult to separate the small amount of gold from the very large amounts of halite and other minerals

When we organize patterns in order to perceive an entire stimulus rather than just its parts, we are using

Look at the data above. provide an explanation for europe’s projected population decrease by the year 2050. (i'm doing this for future kids) the answer is : the percentage of people over the age of 65 and under the age of 15 in europe is currently the same at 16% each. therefore, the majority of the population is between the ages of 16 and 64. in forty years from now, in 2050, a greater percentage of the population will be over the age of 65. europe also has a relatively long life expectancy of 75 years. this, combined with a low birth rate means that by 2050 europe’s population will actually be less than it is today.