GS Paper 3:
Syllabus: Awareness in Space.
Context:
Astronomers have reported a fast radio burst (FRB) whose characteristics are different from almost all other FRBs previously detected, except one.
- The latest FRB (Named FRB 20190520B), unlike many other FRBs, emits frequent, repeating bursts of radio waves. Only one FRB has been previously observed to behave this way.
What are FRBs?
FRBs are bright flashes of light that appear for a few milliseconds and then vanish.
- The first FRB was discovered in 2007. Since then 140 more were discovered until June 2021.
How are they produced?
The astronomers have suggested that the candidates for the sources of FRBs are the superdense neutron stars left over after a supernova, or magnetars (neutron stars with ultra-strong magnetic fields).
What are Magnetars?
A magnetar is a type of neutron star.
- They are the most powerful magnets in the cosmos.
- Their magnetic fields are 5,000 trillion times more powerful than that of the Earth.
InstaLinks:
Prelims Link:
- What are radio waves?
- What are Magnetars?
- What is a neutron star?
Mains Link:
What are FRBs? How are they significant in understanding our universe? Discuss.
Q. 6) Consider the following statements:
- A magnetar is a type of neutron star.
- Magnetic fields of Magnetars are 5,000 trillion times more powerful than that of the Earth.
Which of the above statements is/are correct?
- 1 only.
- 2 only.
- Both.
- None.
Sources: Indian Express.
