Autodesk is conducting a survey to gather feedback on AutoCAD HELP. A lot of people did not like the change to primarily online help, now is your chance to tell them. There are also questions on what kind of content you would like to see in HELP.
Many people are aware of the AutoCAD drawing (v 2.18) of the solar system, circa 1985. The name of the file is solar.dwg and it was included as a sample drawing at one point. You can download the drawing from this Between the Lines post from a couple of years ago.
Why am I bringing this up again now? I just thought is was pretty awesome that you can view this drawing using AutoCAD 360, on a smartphone. At one extreme, you can view the entire solar system including the almost 6 BILLION km orbit of Pluto. At the other extreme, you can zoom all the way down to the ±1/3 inch writing on the plaque on the lunar lander sitting on the moon. See screenshots below. (Note: I changed the colors of the linework to green in the screenshots for visual clarity)
I have seen this question a few times in person and on various forums. For at least one version prior to AutoCAD 2011, AutoCAD arcs included directional arrow grips on the ends that performed as Lengthen grips.
AutoCAD 2011 introduced multifunctional grips that allow for (you guessed it) multiple functions, and the arrows disappeared.
If you want to restore the arrow grips, you can set GRIPMULTIFUNCTIONAL to 0