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.
The observable universe is approximately 90 billion light years in diameter and the Earth is approximately 12000km in diameter. Let's assume that a grain of sand is 0.5mm in diameter. If we shrink the Earth down to the size of that grain of sand it would become 1/24000000000 (one 24 billionth) its original size. The observable universe, shrunk down by the same factor, would become 3.75 light years in diameter.