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.
Using Newtonâs Laws in the late 1790s, John Michell of England and Pierre-Simon Laplace of France independently suggested the existence of an invisible star.. Michell and Laplace calculated the mass and size â which is now called the event horizon â that an object needs in order to have an escape velocity greater than the speed of light. In 1915, Einstein's theory of general relativity predicted the existence of black holes.