Universe Questions and Answers – Page 3

Correct Answer: Option D — Proxima Centauri. Proxima Centauri is correct because it is it is about 4.24 light-years away. It is also associated with a red dwarf star. Together, these two facts identify Proxima Centauri precisely within Universe. Why the other options are incorrect: Option A — Polaris: Polaris is it lies close to the north celestial pole. It is also associated with a Cepheid variable star, so these facts identify Polaris rather than Proxima Centauri. Option B — Betelgeuse: Betelgeuse is it is a variable star nearing a late evolutionary stage. It is also associated with a red supergiant star, so these facts identify Betelgeuse rather than Proxima Centauri. Option C — Crab Nebula: Crab Nebula is it contains the Crab Pulsar. It is also associated with a supernova remnant, so these facts identify Crab Nebula rather than Proxima Centauri. Exam Takeaway: Link Proxima Centauri with “it is about 4.24 light-years away” and “a red dwarf star” for quick revision.

Correct Answer: Option C — Proxima Centauri. Proxima Centauri is correct because it is the nearest known star to the Sun. It is also associated with it is about 4.24 light-years away. Together, these two facts identify Proxima Centauri precisely within Universe. Why the other options are incorrect: Option A — Polaris: Polaris is commonly called the North Star. It is also associated with it lies close to the north celestial pole, so these facts identify Polaris rather than Proxima Centauri. Option B — Betelgeuse: Betelgeuse is it marks one shoulder of Orion. It is also associated with it is a variable star nearing a late evolutionary stage, so these facts identify Betelgeuse rather than Proxima Centauri. Option D — Crab Nebula: Crab Nebula is associated with a supernova observed in 1054 CE. It is also associated with it contains the Crab Pulsar, so these facts identify Crab Nebula rather than Proxima Centauri. Exam Takeaway: Link Proxima Centauri with “the nearest known star to the Sun” and “it is about 4.24 light-years away” for quick revision.

Correct Answer: Option B — Proxima Centauri. Proxima Centauri is correct because it is part of the Alpha Centauri stellar system. It is also associated with the nearest known star to the Sun. Together, these two facts identify Proxima Centauri precisely within Universe. Why the other options are incorrect: Option A — Polaris: Polaris is located in Ursa Minor. It is also associated with commonly called the North Star, so these facts identify Polaris rather than Proxima Centauri. Option C — Betelgeuse: Betelgeuse is located in the constellation Orion. It is also associated with it marks one shoulder of Orion, so these facts identify Betelgeuse rather than Proxima Centauri. Option D — Crab Nebula: Crab Nebula is located in the constellation Taurus. It is also associated with associated with a supernova observed in 1054 CE, so these facts identify Crab Nebula rather than Proxima Centauri. Exam Takeaway: Link Proxima Centauri with “part of the Alpha Centauri stellar system” and “the nearest known star to the Sun” for quick revision.

Correct Answer: Option A — Proxima Centauri. Proxima Centauri is correct because it is a red dwarf star. It is also associated with part of the Alpha Centauri stellar system. Together, these two facts identify Proxima Centauri precisely within Universe. Why the other options are incorrect: Option B — Polaris: Polaris is a Cepheid variable star. It is also associated with located in Ursa Minor, so these facts identify Polaris rather than Proxima Centauri. Option C — Betelgeuse: Betelgeuse is a red supergiant star. It is also associated with located in the constellation Orion, so these facts identify Betelgeuse rather than Proxima Centauri. Option D — Crab Nebula: Crab Nebula is a supernova remnant. It is also associated with located in the constellation Taurus, so these facts identify Crab Nebula rather than Proxima Centauri. Exam Takeaway: Link Proxima Centauri with “a red dwarf star” and “part of the Alpha Centauri stellar system” for quick revision.

Correct Answer: Option D — Sirius. Sirius is correct because it is it is about 8.6 light-years from Earth. It is also associated with a binary star system. Together, these two facts identify Sirius precisely within Universe. Why the other options are incorrect: Option A — Proxima Centauri: Proxima Centauri is it is about 4.24 light-years away. It is also associated with a red dwarf star, so these facts identify Proxima Centauri rather than Sirius. Option B — Polaris: Polaris is it lies close to the north celestial pole. It is also associated with a Cepheid variable star, so these facts identify Polaris rather than Sirius. Option C — Betelgeuse: Betelgeuse is it is a variable star nearing a late evolutionary stage. It is also associated with a red supergiant star, so these facts identify Betelgeuse rather than Sirius. Exam Takeaway: Link Sirius with “it is about 8.6 light-years from Earth” and “a binary star system” for quick revision.

Correct Answer: Option C — Sirius. Sirius is correct because it is the brightest star in Earth's night sky. It is also associated with it is about 8.6 light-years from Earth. Together, these two facts identify Sirius precisely within Universe. Why the other options are incorrect: Option A — Proxima Centauri: Proxima Centauri is the nearest known star to the Sun. It is also associated with it is about 4.24 light-years away, so these facts identify Proxima Centauri rather than Sirius. Option B — Polaris: Polaris is commonly called the North Star. It is also associated with it lies close to the north celestial pole, so these facts identify Polaris rather than Sirius. Option D — Betelgeuse: Betelgeuse is it marks one shoulder of Orion. It is also associated with it is a variable star nearing a late evolutionary stage, so these facts identify Betelgeuse rather than Sirius. Exam Takeaway: Link Sirius with “the brightest star in Earth's night sky” and “it is about 8.6 light-years from Earth” for quick revision.

Correct Answer: Option B — Sirius. Sirius is correct because it is located in the constellation Canis Major. It is also associated with the brightest star in Earth's night sky. Together, these two facts identify Sirius precisely within Universe. Why the other options are incorrect: Option A — Proxima Centauri: Proxima Centauri is part of the Alpha Centauri stellar system. It is also associated with the nearest known star to the Sun, so these facts identify Proxima Centauri rather than Sirius. Option C — Polaris: Polaris is located in Ursa Minor. It is also associated with commonly called the North Star, so these facts identify Polaris rather than Sirius. Option D — Betelgeuse: Betelgeuse is located in the constellation Orion. It is also associated with it marks one shoulder of Orion, so these facts identify Betelgeuse rather than Sirius. Exam Takeaway: Link Sirius with “located in the constellation Canis Major” and “the brightest star in Earth's night sky” for quick revision.

Correct Answer: Option A — Sirius. Sirius is correct because it is a binary star system. It is also associated with located in the constellation Canis Major. Together, these two facts identify Sirius precisely within Universe. Why the other options are incorrect: Option B — Proxima Centauri: Proxima Centauri is a red dwarf star. It is also associated with part of the Alpha Centauri stellar system, so these facts identify Proxima Centauri rather than Sirius. Option C — Polaris: Polaris is a Cepheid variable star. It is also associated with located in Ursa Minor, so these facts identify Polaris rather than Sirius. Option D — Betelgeuse: Betelgeuse is a red supergiant star. It is also associated with located in the constellation Orion, so these facts identify Betelgeuse rather than Sirius. Exam Takeaway: Link Sirius with “a binary star system” and “located in the constellation Canis Major” for quick revision.

Correct Answer: Option D — Sun. Sun is correct because it is sunlight reaches Earth in about 8 minutes 20 seconds. It is also associated with a G-type main-sequence star. Together, these two facts identify Sun precisely within Universe. Why the other options are incorrect: Option A — Sirius: Sirius is it is about 8.6 light-years from Earth. It is also associated with a binary star system, so these facts identify Sirius rather than Sun. Option B — Proxima Centauri: Proxima Centauri is it is about 4.24 light-years away. It is also associated with a red dwarf star, so these facts identify Proxima Centauri rather than Sun. Option C — Polaris: Polaris is it lies close to the north celestial pole. It is also associated with a Cepheid variable star, so these facts identify Polaris rather than Sun. Exam Takeaway: Link Sun with “sunlight reaches Earth in about 8 minutes 20 seconds” and “a G-type main-sequence star” for quick revision.

Correct Answer: Option C — Sun. Sun is correct because it is the photosphere is its visible surface. It is also associated with sunlight reaches Earth in about 8 minutes 20 seconds. Together, these two facts identify Sun precisely within Universe. Why the other options are incorrect: Option A — Sirius: Sirius is the brightest star in Earth's night sky. It is also associated with it is about 8.6 light-years from Earth, so these facts identify Sirius rather than Sun. Option B — Proxima Centauri: Proxima Centauri is the nearest known star to the Sun. It is also associated with it is about 4.24 light-years away, so these facts identify Proxima Centauri rather than Sun. Option D — Polaris: Polaris is commonly called the North Star. It is also associated with it lies close to the north celestial pole, so these facts identify Polaris rather than Sun. Exam Takeaway: Link Sun with “the photosphere is its visible surface” and “sunlight reaches Earth in about 8 minutes 20 seconds” for quick revision.