Q1. What is a Galaxy?
It is a huge congregation of billions of stars, which are held together by gravity.
Q2. How else the galaxies are called?
Island Universe - as they are scattered in random and some remain clustered into groups.
Q3. In which galaxy is the present system of the Universe is located?
MILKY WAY - comprising of about 25 galaxies.
Q4. What is a "Local Group" with reference to galaxy?
The Milky Way and its group of galaxies are called so.
Q5. What is the diameter of the galaxy Milky Way?
10 to the power of 5 light years.
Q6. What are the most distant objects in the Local Group the Milky Way?
M31 Andromeda and M33. They remain more than 2 million light years away from our galaxy.
Q7. What is the nearest galaxy to the Milky Way?
ANDROMEDA NEBULA It is about 6.8 % of 10 to the power of 5 light years away from our galaxy.
Q8. Which astronomer classified the galaxies?
Edwin Hubble - American Astronomer in the year 1925.
Q9. How the galaxies have been classified?
Into three shapes -
1. Elliptical
2.Spiral and
3.Barred Spiral.
Q10. Who was the first astronomer to discover galaxies beyond Milky Way?
Edwin Hubble.
Q11. At present which galaxy is thought or believed to be the closest to Milky Way?
The Canis Major dwarf galaxy.
Q12. What is the shape of the Milky Way galaxy and what is its composition?
This galaxy, of which the Sun and its system form part, is a spiral shaped mass of hundreds of millions of stars.
Q13. Which is the brightest galaxy?
LARGE MAGELLANIC CLOUD - visible only in the Southern Hemisphere. It is 1,70,000 light years from Earth with 39000 light years in di
Q14. Which is the largest galaxy?
ABELL - 2029. Discovered in 1990. It is 1070 million light years distant and has a diameter of 5.6 million light years - 80 times the diameter of our galaxy Milky Way.
Q15. Which is the nearest galaxy?
The SAGITTARIUS DWARF - about 70000 light years from Earth. Discovered in 1994.
Q16. Which is the remotest visible object?
ANDROMEDA galaxy. It is a bout 230900 light years from Earth. Has about 300 billion stars with a diameter of 1,80,000 light years.
Q17. Which is the most distant galaxy?
ABELL 135 IR 1916 - about 13.2 billion light years from Earth. Discovered by the astronomers at European Southern Observatory, Chile in 2004.
Q18. What are QASARS ?
Extremely distant Radio Galaxies. Their radio emission is greater than normal galaxies.
