Milky Way - Aakash Ganga
Way (Aakash Ganga)
with other galaxies, our galaxy, the Milky Way, is relatively large. It measures
approximately 100,000 light years across. The Earth and the rest of our Solar
System lie about 28,000 light years from the middle of the Milky Way.
astronomers are convinced that the Milky Way is a spiral galaxy. Some, though,
have suggested that it might be a barred spiral galaxy instead.
all spiral and barred spiral galaxies, the Milky Way rotates. Closer to the
middle it rotates faster than at its edges. Our Solar System revolves around the
middle of the galaxy about once every 225 million years. According to this
theory, the Solar System has only rotated once since the earliest dinosaurs
walked the Earth.
a clear night, you can see a broad, dense band of stars which stretches across
the sky. In ancient times, people thought this band looked like a trail of
spilled milk. This is how our galaxy gets its name. When you look along this
band, you are looking toward the middle of the Milky Way.
the northern hemisphere, the best time to see the Milky Way is between the
months of July and September. It also looks impressive on dark midwinter nights.
the southern hemisphere, the Milky Way is seen at its most spectacular between
October and December. This is when it looks most like a trail of spilled milk
across the sky.