Enter the amount to be converted in the box to the left of the currency and press the convert button. To show Bangladeshi Taka and just one other currency click on any other currency. The Bangladeshi Taka is the currency in Bangladesh (BD, BGD). The symbol for BDT can be written Tk.
Mass, Size, and Density of the Universe. The mass density of visible matter (i.e., galaxies) in the Universe is estimated at 3e-28 kg/m^3 (3e-31 times the mass density of water). The radius of the visible Universe is estimated at 1.7e26 m (18 thousand million lightyears) plus or minus 20 percent or so.
For other uses, see Universe (disambiguation). The Universe is all of time and space and its contents. It includes planets, moons, minor planets, stars, galaxies, the contents of intergalactic space, and all matter and energy. The observable universe is about 28 billion parsecs (91 billion light-years) in diameter. The size of the entire Universe is unknown, but there are many hypotheses about the composition and evolution of the Universe.