Download Std VII Science Constellations And Galaxies Q I Name the

Std VII
Science
Q I
Constellations And Galaxies
Name the following
1. The branch of science that deals with the study of celestial objects.
_________Astronomy
2. A group of stars with the name assigned to it.
_____-Constellation .
3. The distance travelled by light , in vacuum in a year.
______Light year
Q II
Answer the following
1. What is the universe ?
Ans.
The planets , stars, moon, satellites, all heavenly bodies, everything on the earth and the
emptiness in between forms the universe .
2. What are galaxies?
Ans.
Galaxies are a collection of stars ,gases and dust bound together by gravity.
3. Name the galaxy we are on. What type of galaxy is it?
Ans.
4.
We are on milky way galaxy. The milky way is a spiral galaxy.
Define the following
a) Elliptical galaxy-_____Elliptical galaxies are mostly spherical in shape formed by the collision
of smaller spiral galaxies.
b) Spiral galaxies-------- Spiral galaxies consists of a flat central disk with spiral arms.
c) Irregular galaxies -----An irregular galaxy is a galaxy that does not have a distinct regular
shape.
5. What is an orbit? What is its shape .
Ans.
The path traced by a heavenly body around another is called an orbit. Orbit in the shape
of an ellipse.
6. Explain the following
a)
Ursa major-----This constellation is also called the Great Bear. It is visible through out the
year but best seen in the month of April. Its Indian name is Saptharishi.
b) Ursa Minor ____Ursa minor means smaller bear. It is seen in the northern sky. The pole star
is one of the star in this constellation.
c) Orion ______This constellation is visible during winter. It consists of a group of seven bright
stars and several faint stars. The stars Betelgueuse and Rigel are two of its bright stars.Orion
is also called the hunter. Its Indian name is Mriga