Data from which space mission enabled the discovery that UBC 63 is a double cluster system?
- A.Hubble Space Telescope of NASA
- B.Gaia mission of the European Space Agency
- C.AstroSat of ISRO
- D.James Webb Space Telescope
Correct answer
Explanation
The correct answer is the Gaia mission of the European Space Agency. The researchers used Gaia measurements, which give exceptionally precise positions and motions for stars right across the Milky Way, and it was these data that revealed two populations of starkly different ages inside what had been taken for one cluster. The team then applied machine learning techniques and dynamical simulations on high-performance computing to confirm the result, and traced the paths of the two clusters through the Galaxy. The work was carried out by researchers of Gauhati University, including a Department of Science and Technology INSPIRE Senior Research Fellow, along with the Indian Institute of Astrophysics and foreign collaborators, and published in the Astronomical Journal. Options A, C and D name other well-known observatories and missions that had no part in this particular study, so option B is right.
Read the full article: Indian Astronomers Find Star Cluster UBC 63 Is Really Two
Practice Questions
What did a team led by Indian astronomers find about the galactic open cluster UBC 63?
- A.It is the nearest open cluster to the Sun
- B.It is actually two distinct clusters that passed close to each other
- C.It hosts the first planet found outside the Milky Way
- D.It is merging with the Andromeda galaxy
Show answer
The group, which lies about 4892 light years away and had been treated in the limited earlier literature as a single cluster, was found to hold two separate stellar populations, now named UBC 63A and UBC 63B. Their brightness and colours formed two sequences in the colour magnitude diagram, and…
Read the full explanation →What are the approximate ages of UBC 63A and UBC 63B?
- A.21 million years and 562 million years
- B.562 million years and 21 million years
- C.100 million years and 400 million years
- D.6 million years and 26 million years
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UBC 63A is the young cluster of the pair at roughly twenty-one million years, while UBC 63B is much older at about five hundred sixty-two million years.
Read the full explanation →What authorisation fee has TRAI recommended for Satellite Communication Network provider authorised entities?
- A.3 per cent of Adjusted Gross Revenue
- B.5 per cent of Adjusted Gross Revenue
- C.8 per cent of Adjusted Gross Revenue
- D.12 per cent of Adjusted Gross Revenue
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TRAI has recommended that the authorisation fee for a Satellite Communication Network provider authorised entity be eight per cent of its adjusted gross revenue, and that no minimum authorisation fee be imposed on it.
Read the full explanation →What is the maximum duration recommended for the Satellite Communication Network Provider Authorisation?
- A.5 years
- B.10 years
- C.20 years
- D.30 years
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TRAI has recommended that the Satellite Communication Network Provider Authorisation be granted for the national area with a maximum duration of twenty years, and that it carry a provision for renewal for up to a further twenty years.
Read the full explanation →Under which section of the Telecommunications Act, 2023 has TRAI recommended creating the Satellite Communication Network Provider Authorisation?
- A.Section 2(1)(a)
- B.Section 3(1)(b)
- C.Section 4(4)
- D.Section 10(2)
Show answer
The Department of Telecommunications had told the regulator that it proposed to bring in a Satellite Communication Network authorisation under Section 3(1)(b) of the Telecommunications Act, 2023, and asked TRAI for the terms and conditions, including spectrum assignment for feeder and user links.
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