Go onto the APOD website (http://apod.nasa.gov/apod/) and look in the archive (or search) for a cool looking galaxy or of the Milky Way. Post the image to this forum as well as a link to the APOD picture. Share your picture with the rest of the class. From the description, describe what kind of galaxy it is and anything interesting about it. Use your own words, no need to simply re- type what is already written there. Relate this particular galaxy back to something you’ve learned in this class about the diversity of galaxy types and why there is such diversity, Solution link: http://apod.nasa.gov/apod/ Want to take a fast trip to the edge of the Solar System? Consider a ride on a Heliopause Electrostatic Rapid Transit System (HERTS). The concept is currently being tested and it might take only 10 to 15 years to make the trip of over 100 Astronomical Units (15 billion kilometers). That\'s fast compared to the 35 years it took Voyager 1, presently humanity\'s most distant spacecraft, to approach the heliopause or outer boundary of the influence of the solar wind. HERTS would use an advanced electric solar sail that works by extending multiple, 20 kilometer or so long, 1 millimeter thin, positively charged wires from a rotating spacecraft. The electrostatic force generated repels fast moving solar wind protons to create thrust. Compared to a reflective solar light sail, another propellantless deep space propulsion system, the electric solar wind sail could continue to accelerate at greater distances from the Sun, still developing thrust as it cruised toward the outer planets..

1. Go onto the APOD website (http://apod.nasa.gov/apod/) and look in the archive (or search) for a
cool looking galaxy or of the Milky Way. Post the image to this forum as well as a link to the
APOD picture. Share your picture with the rest of the class. From the description, describe what
kind of galaxy it is and anything interesting about it. Use your own words, no need to simply re-
type what is already written there. Relate this particular galaxy back to something you’ve learned
in this class about the diversity of galaxy types and why there is such diversity,
Solution
link: http://apod.nasa.gov/apod/
Want to take a fast trip to the edge of the Solar System? Consider a ride on a Heliopause
Electrostatic Rapid Transit System (HERTS). The concept is currently being tested and it might
take only 10 to 15 years to make the trip of over 100 Astronomical Units (15 billion kilometers).
That's fast compared to the 35 years it took Voyager 1, presently humanity's most distant
spacecraft, to approach the heliopause or outer boundary of the influence of the solar wind.
HERTS would use an advanced electric solar sail that works by extending multiple, 20 kilometer
or so long, 1 millimeter thin, positively charged wires from a rotating spacecraft. The
electrostatic force generated repels fast moving solar wind protons to create thrust. Compared to
a reflective solar light sail, another propellantless deep space propulsion system, the electric solar
wind sail could continue to accelerate at greater distances from the Sun, still developing thrust as
it cruised toward the outer planets.