Which of the following statements about Supernova 1987A is FALSE? a. it exploded relatively close to us, in a spiral arm of the Milky Way Galaxy b. it was only visible from the Southern Hemisphere c. astronomers believe it was the explosion of a star that was originally a massive type O e. it was observed with instruments in space as well as on the ground
Stellar evolution
We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.
Red Shift
It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.
Which of the following statements about Supernova 1987A is FALSE?
a. it exploded relatively close to us, in a spiral arm of the Milky Way Galaxy
b. it was only visible from the Southern Hemisphere
c. astronomers believe it was the explosion of a star that was originally a massive type O
e. it was observed with instruments in space as well as on the ground
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