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What did a team led by Indian astronomers find about the galactic open cluster UBC 63?

  1. A.It is the nearest open cluster to the Sun
  2. B.It is actually two distinct clusters that passed close to each other
  3. C.It hosts the first planet found outside the Milky Way
  4. D.It is merging with the Andromeda galaxy

Correct answer

B. It is actually two distinct clusters that passed close to each other

Explanation

The correct answer is that UBC 63 is actually two distinct clusters that recently passed close to each other. 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 machine learning along with dynamical simulations confirmed the split. Option A is wrong because nothing in the finding concerns the nearest cluster to the Sun; the distance of about 4892 light years is simply where UBC 63 sits. Option C is wrong because no planet discovery is involved, the work being about cluster dynamics. Option D is wrong because the encounter described is between the two parts of UBC 63 within the Milky Way, not between galaxies. So option B is right.

Read the full article: Indian Astronomers Find Star Cluster UBC 63 Is Really Two

Practice Questions

Q1.Science & TechnologyMedium

What are the approximate ages of UBC 63A and UBC 63B?

  1. A.21 million years and 562 million years
  2. B.562 million years and 21 million years
  3. C.100 million years and 400 million years
  4. D.6 million years and 26 million years
Show answer
Correct answer: A. 21 million years and 562 million years

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.

Q2.Science & TechnologyMedium

Data from which space mission enabled the discovery that UBC 63 is a double cluster system?

  1. A.Hubble Space Telescope of NASA
  2. B.Gaia mission of the European Space Agency
  3. C.AstroSat of ISRO
  4. D.James Webb Space Telescope
Show answer
Correct answer: B. 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.

Q3.Science & TechnologyMedium

What authorisation fee has TRAI recommended for Satellite Communication Network provider authorised entities?

  1. A.3 per cent of Adjusted Gross Revenue
  2. B.5 per cent of Adjusted Gross Revenue
  3. C.8 per cent of Adjusted Gross Revenue
  4. D.12 per cent of Adjusted Gross Revenue
Show answer
Correct answer: C. 8 per cent of Adjusted Gross Revenue

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.

Q5.Science & TechnologyMedium

Under which section of the Telecommunications Act, 2023 has TRAI recommended creating the Satellite Communication Network Provider Authorisation?

  1. A.Section 2(1)(a)
  2. B.Section 3(1)(b)
  3. C.Section 4(4)
  4. D.Section 10(2)
Show answer
Correct answer: B. Section 3(1)(b)

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.