Hey my mom makes lasagna all the time and we freeze the leftovers. It will last a good two weeks in the freezer. My advice is to take it out of the fridge and stick it in the freezer. Lasagna is always better the day after it was made, i.e. as leftovers.
Thus, the part of the Universe we can observe (the Visible Universe) lies within a sphere with a radius of 13.7 billion light years centered around the Earth. 1  We can only observe 13.7 billion light years of the Universe. 2  We are only able to see the parts of the Universe whose light has had time to reach us.
The Milky Way is the galaxy in which the solar system (and our Earth) is located. It is around 13 billion years old, which is just a little less than the age of the Universe. The Milky Way is one of billions of galaxies that astronomers are able to observe. We didn't always know this.