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Who developed the spectral classification system for stars?

Henry Draper

What is the hottest natural substance on earth?


Why does the sun’s corona show emission lines?

The corona shines brightly in x-rays because of its high temperature. On the other hand, the “cool” solar photosphere emits very few x-rays. This allows us to view the corona across the disk of the Sun when we observe the Sun in X-rays.

Can the sun turn black?

In the parts of the corona where the particles leave the sun, the glow is much dimmer and the coronal hole looks dark. ‘Coronal holes are lower density and temperature regions of the sun’s outer atmosphere, known as the corona,’ explained Nasa.

Is Lightning 5 times hotter than the sun?

Air is a very poor conductor of electricity and gets extremely hot when lightning passes through it. In fact, lightning can heat the air it passes through to 50,000 degrees Fahrenheit (5 times hotter than the surface of the sun).

What color Lightning is the strongest?

What Color Lightning is the Strongest?

  • Blue – this color of lightning is an indication that a high precipitation storm is occurring with chances of hail.
  • Purple – this color of lightning occurs when there is high humidity in the atmosphere and is typically accompanied by high precipitation.

What heats up the corona?

When the active region decayed and the magnetic field was dispersed, the field lines are only energized by surface convective motions shaking the field lines, and such quiet-region corona is heated by magnetic waves.

Is the sun hotter than lightning?

Lightning is four times hotter than the sun. The surface of the sun is around 11,000 degrees F. Scientists determined that temperature more than 20 years ago by examining the light given off by a bolt of lightning.

Which type of spectrum does the radiation from most stars produce?

Even hotter stars and other objects emit the most radiation in the blue, ultraviolet or even x-ray and gamma ray part of the spectrum. Objects like these appear blue to our eyes. Much cooler objects like planets and humans emit the most radiation in the infrared. Even cooler objects emit microwaves and radio waves.

What part of the sun is the coolest?


Which is hotter lightning or lava?

Lightning because lightning is 70,000 degrees Fahrenheit. Lava is just 2,240 degrees Fahrenheit. So lightning is hotter than lava.

What is Corona in sun?

Definition: Corona is a luminous envelope of plasma that surrounds the Sun and other celestial bodies. It is extended to millions of kilometres into space and is commonly seen during a total solar eclipse. The matter in the external part of the atmosphere of the Sun is composed of plasma which has very low density.

What else can we learn from stellar spectra?

From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star. The spectral line also can tell us about any magnetic field of the star. The width of the line can tell us how fast the material is moving. We can learn about winds in stars from this.

What is the rarest color of lightning?

Yellow lightning is uncommon; however, they tend to be cooler than the blue, lilac and white. They’re caused to due to a high concentration of dust in the air. And is an indication of a dry thunderstorm with low-precipitation. White lightning is the hottest, and literally, all bolts radiate white color.

Post Author: alisa