Milky Way

Compare the solar system with the Milky Way Galaxy. (They are very different, but the terms are often confused.) What are two similarities and two differences in their structure?

Milky Way & Other

1.The Milky Way is a spiral _____________ and the number of stars it contains is about _________. 2. If a Galaxy is moving away from Earth it’s spectra is ______________ due to the Doppler Effect. 3. The Sun can be found in the _____________ arm of the Milky Way. 4. The Big Bang Theory places the age of the Universe at __________ years. 5. Two methods used for measuring distances to star clusters are _________ and _________. 6. The explosion of a large star, greater than 8 solar masses , is called a __________ and such a star is destined to become either a neutron star or a ___________.

Black Hole

7. The Sun Rotates around the Milky Way Galaxy at a speed of a. 250 Km / sec and it makes an orbit in 20 Million years b. 20 Km / sec and it completes an orbit in 220 Million years c. 250 Km / sec and completes an orbit in 220 Million years d. 250 Km / sec but the time to complete an orbit can vary substantially from orbit to orbit based on neighboring star positions. 8. Dark matter has been postulated to explain a. why the night sky in not completely illuminated by stars b. the discrepancy in orbital periods observed for stars in the Milky Way c. the material that is ejected by Black Holes when they evaporate d. the scattering of light... click for more

Magnetic energy of solar flare

The problem reads as: "The magnetic field permeating a region of space represents stored energy. This energy is often quantified in terms of its density (magnetic energy per unit volume) given by B^2/(2*u) where u=4*pi X 10^(-7). Suppose an "X2" flare occurs within a volume of 10^12 km3 over a sunspot pair initially permeated by an average magnetic field strength of 1000 Gauss. Calculate the total magnetic energy in Joules stored in the volume before the flare occurs. " My dilemma.....I know that the given formula for magnetic pressure is a simplified version of the entire magnetic momentum flux relationship. But how can I use what is given? (a relationship in terms of density seems... click for more

Compare the science of Earth with the other planets in our solar system.

Astronomy Planetary Comparison Compare the science of Earth with the other planets in our solar system. Include the following: a. Briefly describe the properties of our planet and explain them. Include the qualities of the Earth’s interior and how we learn about it, as well as a description of properties that shape and change the Earth’s surface (e.g. volcanism, tectonics, and erosion). b. Examine each planet in our solar system. How does it compare to Earth? What are its unique characteristics? Why do these features exist on that planet, as oppo... click for more