Oumuamua
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Context
- ‘Oumuamua, a mysterious object up to 400 meters long had entered the Solar System in 2017.
- Now, a team of researchers says Oumuamua was definitely a comet.
Details
- ʻOumuamua is the first interstellar object detected passing through the Solar System.
- When it was first observed, it was about 33 million km from Earth (about 85 times as far away as the Moon) and already heading away from the Sun.
- Oumuamua is a small object estimated to be between 100 and 1,000 metres long.
- It has a red color, similar to objects in the outer Solar System.
- Despite its close approach to the Sun, it showed no signs of having a coma.
- It has exhibited non‑gravitational acceleration, potentially due to outgassing or a push from solar radiation pressure.
- It has a rotation rate similar to that of Solar System asteroids.
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PRACTICE QUESTION (EASY) Q. Choose the incorrect answer/answers with reference to the following statements. A. Asteroid is a small Solar System body that warms and begins to release gases when passing close to the Sun, a process called outgassing. B. Comets sometimes called minor planets, are rocky, airless remnants left over from the early formation of our solar system about 4.6 billion years ago. 1. A only 2. B only 3. Both A and B 4. Neither A nor B Answer: 3 |
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