How Would You Define an X-ray Source?
A source of X-rays is something that emits X-rays. In space, astronomers search for X-ray sources. Radiation emitted by objects in space can take…
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Astronomers
How Will You Describe Quasars?
Quasars are astronomical objects of very high luminosity found in the centers of some galaxies and powered by gas spiraling at high velocity into…
Why Is Our Galaxy Shaped like a Spiral?
A galaxy is a huge number of stars grouped together. Our galaxy contains about 1,00,000 million stars. It looks like a disc with a flat cen
What Is a Calendar Used For?
Calendar is a system used for calculating time. Calendars usually divide year into months and days. A year is the time it takes for the Ear
When Will Halley’s Comet next Appear?
Halley’s Comet appeared in 1910, then in 1986 and will next appear in mid-2061, during that most recent visit, five spacecraft from the USSR