After a powder-processed part is pressed, and before it is sintered, it is called a(n) ___________compact.
Fill in the blank(s) with the appropriate word(s).
green
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Radio lobes are held together by their magnetic fields
Indicate whether the statement is true or false
Which of the following is NOT true about color and visual contrast in web design?
A. Webpages can use color to evoke mood. B. Limit your website color scheme to five or six contrasting colors. C. The WAI specifies that color contrast should be sufficient for visitors using a monochrome monitor. D. One way to select an appropriate color scheme is to use a template.
Quasars are common in the early Universe because ____ at that time
a. galactic collisions were more frequent b. black hole collisions were more frequent c. gas and dust clouds were denser d. galaxies were more isolated e. central bulges were larger
Sirius, the brightest star in the night sky, is actually a binary star system. Sirius A is main-sequence star and Sirius B is a white dwarf. Nearly all the visible light we see from Sirius comes from Sirius A. But when we photograph the system with x-ray light, as shown here, Sirius B is the brighter of the two stars. Why?
A) As a white dwarf, Sirius B is much hotter than Sirius A and thus emits more x-rays. B) As a white dwarf, Sirius B is too small to emit visible light but not too small to emit x-rays. C) Sirius B is brighter in x-rays because it is a nova. D) Sirius B is brighter in x-rays because it is a white dwarf supernova.