Slight update to lab 6

Lab 6/Lab 6.ipynb

@@ -172,6 +172,13 @@
     "*Your answer here*"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "I highly recommend you spend some time browsing some images of the Messier Catalog (look up the Hubble Space Telescope Messier Catalog) just for fun! They are gorgeous astronomical objects!"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},