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 maximum observed mass of neutron stars is about 2 M â . The smallest observed mass of a stellar black hole is about 5 M â , though compact stars with more than 10 M â will overcome the neutron degeneracy pressure and gravitational collapse will usually occur to produce a black hole.eutron stars are the densest and smallest stars known to exist in the universe; with a radius of only about 12â13 km (7 mi), they can have a mass of about twice that of the Sun.