The Doppler Effect Milky Way Structure How Many Stars Are in the Milky Way? Exploring the Milky Way From Inside the Galaxy The Milky Way, our celestial home, has fascinated astronomers for centuries. It is a
This is where energy generated in the core reaches the surface and is radiated out as visible light, making the photosphere the visible "surface" of the sun that we see from Earth. Yet, the sun's enigma deepens when we ascend further out toward its crown jewel: the corona. Against all...
The speed of light is so immutable that, according to the U.S.National Institute of Standards and Technology, it is used to define international standard measurements like the meter (and by extension, the mile, the foot and the inch). Through some crafty equations, it also helps define the...
Explain briefly but clearly how the electron beam in a CRT is focused to a sharp point at the phosphor on the screen. How do you calculate thin film interference? Show equations and explain. Define Lens (astronomy). How can an oscilloscope ...
Define a spectrum and discuss how spectra are used in astronomy. What property of stars can be measured only by using binary-star systems? If there is no observable edge to the universe, can we determine where its center of expansion is? Explain. ...
Why the universe made more matter than antimatter in the Big Bang is a mystery — if the two are perfectly symmetrical, then shouldn't there be an equal amount of both? Nonetheless, this asymmetry appears to be a good thing. If you recall, equal amounts of normal matter and antimatter ...
Conversely to Chap. 9, Chap. 10 describes the exploration of the extremely large and far away. We now know that our sun is just one of billions of stars within a galaxy, which is one of billions of others. The exploration of the universe at distances of
As the model says nothing on the contents of DE (>0,=0,<0) any value will be ok. But a good model should say something. What is dark energy and what is dark matter? Is there a difference? In what context are they referring to. Most of the matter/energy are found as d...
The quotation above is apropos for an assumption often made to circumvent the space-time ambiguity: that the structure does not change in the time it takes to traverse it. A classic example is the identification of the magnetic field-aligned currents in the polar regions (Birkeland1908), global...
3. The universe is expanding (the redshift with distance supports this if it is caused by Doppler shifting due to receding motion - this is the path Cosmology went down). But this has numerous problems; e.g. what caused the big bang, what is it expanding into, what is outside the bo...