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Which among the following best describes Antares, recently seen in the news?
- a)A type of flowering plant native to the Amazon rainforest
- b)A newly discovered exoplanet
- c)A famous landmark in ancient Egyptian architecture
- d)A red supergiant star
Correct answer is option 'D'. Can you explain this answer?
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Which among the following best describes Antares, recently seen in the...
The Bengaluru-based Indian Institute of Astrophysics (IIA) has filmed the passing of the moon in front of Antares, a bright red star.
About Antares:
- Antares, also known as Alpha Scorpii, is the alpha, or brightest, star in the constellation Scorpius, and the 15th-brightest star in the whole night sky.
- It is a massive red supergiant star.
- It is 10,000 times brighter than our Sun.
- It is one of the largest known stars, 700 times the Sun's diameter, large enough to engulf the orbit of Mars if the solar system were centered on it.
- It lies about 600 light-years from the Earth.
- Despite its size, the overall density of Antares is less than one-millionth that of the Sun.
- Antares is also relatively cool as stars go. Its surface temperature is about 6,100 degrees F (3,400 degrees C). That’s in contrast to our sun’s surface temperature of about 10,000 degrees F (5,500 degrees C).
- The star's low-temperature accounts for its ruddy color.
What is a Red Supergiant star?
- They are very large stars that are approaching the later stages of their stellar life.
- They have a radius that is several hundred to 1500 times that of the Sun.
- Though they are great in size, the red color indicates that stars of this type have a relatively low surface temperature.
- They are highly luminous.
- Most red supergiants are variable stars. This means, their degree of brightness changes and fluctuates as seen on Earth.
- Also, these stars are actively losing mass. Nebulae have been seen around them as they expel material.
Hence option d is the correct answer.
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Which among the following best describes Antares, recently seen in the news?a)A type of flowering plant native to the Amazon rainforestb)A newly discovered exoplanetc)A famous landmark in ancient Egyptian architectured)A red supergiantstarCorrect answer is option 'D'. Can you explain this answer?
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