Why was stellar parallax not measured until the 19th century?
What will be an ideal response?
Stars are so far away that even the closest stars have parallax less than an arcsecond, which could not be measured without the technological developments that did not occur until the 19th century.
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The period-luminosity relation is critical in finding distances with:
A) RR Lyrae stars. B) trigonometric parallaxes. C) spectroscopic parallaxes. D) Cepheid variables. E) pulsars.
All heavy elements are made during supernova events
Indicate whether the statement is true or false
If an element has 15 protons and 16 neutrons and 15 electrons, what is the mass number of the element?
A) 31 B) 15 C) 16 D) 30 E) none of the above
Write the node equations for the nodes 1 and 2 of the model of the oak beam sketched in Figure 2-32.
