Read More. I'm sixteen years old. Young, yes, but I have had the shingles. It started off as a just a pain on the ribs underneath my left boob and when it started to turn into a rash about five days later, I went to my school nurse and explained. She immediately sent me home and that day I went to the doctor.
If you assume that the XDF is a typical region of outer space, you can calculate how many XDFs it would take to fill the entire night sky; itâs about 32 million. Multiply by the number of galaxies you find in the XDFâwhich is around 5,500âand thatâs how we arrive at 176 billion galaxies, at least, in the Universe.
Because the universe was born 13.8 billion years ago, we can only observe objects up to a certain distance from Earth â light from more distant objects hasnât had time to reach us yet. And to answer âhow many stars are there,â we must limit the discussion to what we can observe. Astronomers estimate that the observable universe has more than 100 billion galaxies. Our own Milky Way is home to around 300 billion stars, but itâs not representative of galaxies in general. The Milky Way is a titan compared to abundant but faint dwarf galaxies, and it in turn is dwarfed by rare giant elliptical galaxies, which can be 20 times more massive.