There are several ways you can use WWT on your Mac. The simplest way is to just use the web client in your browser without downloading anything. However, this does not give you full access to all of WWT's features. You can also install the Windows Operating System on your Mac and run WWT from there. There are a couple of ways to do that, including bootcamping your Mac and installing a paid program that lets you run Windows on your Mac. For more information on these options, see ...
"Tours" are interactive paths through the night sky, designed to tell a story or teach a particular astronomy concept. They look like movies, but when viewed in WWT, you can pause the tour to explore regions of the sky that catch your interest, and you can click on hyperlinks throughout the tour to learn more about an object or phenomenon.
You may create a tour using the desktop version of WorldWide telescope.
Here is a screen cast of an example tour, made by Alyssa Goodman, called "Dust and Us."...
In the bottom right corner of the WWT window, you should see a small horizontal scale labeled “Planet Size” and going from “Actual” to “Large.” Adjusting this will enlarge the planets, stars, and other objects, keeping their relative sizes accurate, but without scaling the distances proportionally. This makes things much easier to fit on the screen, but makes things look much closer together than they are.
Not every object in the sky has been curated in WWT yet. You can still see this object as it appears in the all-sky surveys by entering specific coordinates (also under the “Search” tab), but there will not be additional images from other telescopes included yet.
If you cannot manually line up the Finder Scope with your desired object, you can find the thumbnail of your desired object in the bottom context bar, right click on the thumbnail, and select “Properties.” This will bring up the Finder Scope screen.
First, check to make sure the Finder Scope is lined up with the correct object. You can do this by reading the name listed on the Finder Scope and comparing it to the name of your desired object. If the object the Finder Scope is focused on is not the object you want, try moving it slightly and see if you can detect your object.
You can also check that the thumbnail that shows up on the Finder Scope matches the image you want to research. You may sometimes find that your Finder Scope is looking at an infrared image when you were trying to...
Try restoring your defaults. Click the sub-menu under the “Settings” tab (click on the little rectangle at the bottom of the tab) and click “Restore Defaults." If that still doesn't work, try closing WorldWide Telescope and then restarting it.