If you go to the Favourites Menu, and select "Setup Shortcuts" that takes you to a page where there's a link to "Edit Existing Favourites". Click on that and the next page lists your current selection. You can remove one (or more) by changing the number in the left hand column to '0'. Then click on "Save changes". You can also change the order of your selections as they appear in the menu by changing the numbers in that lefthand column. Hope this helps.
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The Hubble Telescope has just picked up a sound from a fraction of a second before the Big Bang. The sound was "Uh oh".