What year did people on Earth see the Crab Nebula explode?
A.) 1993.
B.) 1877.
C.) 1054.
D.) 108 B.C.
E.) Around 2,300 B.C.
Ans: C.) 1054.
You might also like to view...
What observational evidence do we have that eruptions in the centers of galaxies involve magnetic fields?
What will be an ideal response?
Photoelectric Effect: A metal surface has a work function of 2.50 eV. What is the longest wavelength of light that will eject electrons from the surface of this metal? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
How long is a leap year in the Gregorian calendar?
a year of exactly 365 days a year of exactly 360 days a year that is skipped in the Julian calendar a year of exactly 366 days
A neutron star has approximately the density of nuclear material. If a neutron star is the mass of the sun, 1.99 x 1030kg, what would be its radius? You may wish to use the relationship r=(1.2 fm)A1/3 together with the mass of a proton, 1.67 x 10-27kg, to estimate.
A. 12 km B. 19 km C. 13 km D. 9.8 km