How do astronomers measure the speed of the Galaxy?

The Andromeda Galaxy
The Andromeda Galaxy is moving towards us with relative speed 225 Km/s (Credit: NASA/JPL-Caltech)

The galaxies are present at such a large distance from the Earth that the motion of galaxies cannot be observed through a telescope. No observable change in the position will be detected even if we observe any galaxy throughout life. Then, you must be wondering how the speed of the galaxy is measured by astronomers? Continue reading “How do astronomers measure the speed of the Galaxy?”

Why is the planet Venus so Hot?

The planet Venus
The planet Venus (Source: NASA)

Can you imagine a temperature at which lead melts? Venus is the planet where such a high temperature exists. Although Venus is not the nearest planet to the sun but still it is the hottest planet in our solar system, hot enough to destroy any space probes in very little time. The temperature of Venus is around 471 degree Celsius whereas the temperature of Mercury is 466 degree Celsius in the day, in spite of being the nearest planet to the sun. Continue reading “Why is the planet Venus so Hot?”

Today Earth has reached the farthest point in orbit around the sun

Today Earth has reached the farthest point in the orbit around the sun, which is also called aphelion. The opposite happens in early January when Earth is at the nearest point in the orbit which is called perihelion. The difference between the two is around 5000000 Km. Continue reading “Today Earth has reached the farthest point in orbit around the sun”

How do Venus and Mercury act as Morning and Evening star?

Most of the people whenever to look towards night sky; they try to find out the brightest star in the sky. If you also had tried the same then you must have observed that the brightest star in the sky can be viewed only during evening or morning. Continue reading “How do Venus and Mercury act as Morning and Evening star?”