As the nearest star from our Solar System, Proxima Centauri is a prime candidate for future interstellar travel and space colonization missions. Proxima Centauri is a red dwarf star about 4.24 light-years distant inside the G-cloud in the constellation of Centaurus. It was discovered in 1915 by Robert Innes, the Director of the Union Observatory in South Africa, and is the nearest known star to the Sun, although it is too faint to be seen with the naked eye. Because of the proximity of this star, its distance from the Sun and angular diameter can be measured directly, from which it can be determined that its
diameter is about one-seventh of that of the Sun. Proxima Centauri’s mass is about an eighth of the Sun’s, and its average density is about 40 times that of the Sun.

Correct Option: C

As the nearest star from our Solar System, Proxima Centauri is a prime candidate for future interstellar travel and space colonization missions. Proxima Centauri is a red dwarf star about 4.24 light-years distant inside the G-cloud in the constellation of Centaurus. It was discovered in 1915 by Robert Innes, the Director of the Union Observatory in South Africa, and is the nearest known star to the Sun, although it is too faint to be seen with the naked eye. Because of the proximity of this star, its distance from the Sun and angular diameter can be measured directly, from which it can be determined that its
diameter is about one-seventh of that of the Sun. Proxima Centauri’s mass is about an eighth of the Sun’s, and its average density is about 40 times that of the Sun.

Jupiter is the biggest planet in our Solar System. It is the largest by mass, volume, and surface area among other statistics. Here are the critical measurements of Jupiter as well as a few other interesting facts about the planet and other bodies in the Jovian system.

Correct Option: D

Jupiter is the biggest planet in our Solar System. It is the largest by mass, volume, and surface area among other statistics. Here are the critical measurements of Jupiter as well as a few other interesting facts about the planet and other bodies in the Jovian system.

The word “pulsar” is a contraction of “pulsating star. A pulsar is formed when a massive star collapses exhausts its supply of fuel. It blasts out in a giant explosion known as a supernova, the most powerful and violent event in the universe. Without the opposing force of nuclear fusion to balance it, gravity begins to pull the mass of the star inward until it implodes. In a pulsar, gravity compacts the mass of the star until it forms an object composed primarily of neutrons packed so tightly that they no longer exist as normal matter. As the star collapses, it begins to spin more rapidly in what is known as the conservation of angular momentum. The process is similar to that of an ice skater pulling their arms in close to spin faster. What is left behind is a rapidly spinning ball of tightly packed neutrons inside an iron shell..

Correct Option: C

The word “pulsar” is a contraction of “pulsating star. A pulsar is formed when a massive star collapses exhausts its supply of fuel. It blasts out in a giant explosion known as a supernova, the most powerful and violent event in the universe. Without the opposing force of nuclear fusion to balance it, gravity begins to pull the mass of the star inward until it implodes. In a pulsar, gravity compacts the mass of the star until it forms an object composed primarily of neutrons packed so tightly that they no longer exist as normal matter. As the star collapses, it begins to spin more rapidly in what is known as the conservation of angular momentum. The process is similar to that of an ice skater pulling their arms in close to spin faster. What is left behind is a rapidly spinning ball of tightly packed neutrons inside an iron shell..

Pluto, formal designation 134340 Pluto, is the second-most-massive known dwarf planet in the Solar System (after Eris) and the tenth-most-massive body observed directly orbiting the Sun. Originally classified as the ninth planet from the Sun, Pluto was recategorized as a dwarf planet and plutoid owing to the discovery that it is only one of several large bodies within the Kuiper belt. Like other members of the Kuiper belt, Pluto is composed primarily of rock and ice and is relatively small, approximately one-sixth the mass of the Earth’s Moon and one-third its volume. It has an eccentric and highly inclined orbit that takes it from 30 to 49 AU (4.4–7.4 billion km) from the Sun. This causes Pluto to periodically come closer to the Sun than Neptune. Pluto gets as close as 4.44 billion km. But its orbit is so elliptical that it gets out to a distance of 7.38 billion km. In fact, there are times in Pluto’s orbit when Neptune passes it. Then Neptune really is the farthest planet from the Sun.

Correct Option: C

Pluto, formal designation 134340 Pluto, is the second-most-massive known dwarf planet in the Solar System (after Eris) and the tenth-most-massive body observed directly orbiting the Sun. Originally classified as the ninth planet from the Sun, Pluto was recategorized as a dwarf planet and plutoid owing to the discovery that it is only one of several large bodies within the Kuiper belt. Like other members of the Kuiper belt, Pluto is composed primarily of rock and ice and is relatively small, approximately one-sixth the mass of the Earth’s Moon and one-third its volume. It has an eccentric and highly inclined orbit that takes it from 30 to 49 AU (4.4–7.4 billion km) from the Sun. This causes Pluto to periodically come closer to the Sun than Neptune. Pluto gets as close as 4.44 billion km. But its orbit is so elliptical that it gets out to a distance of 7.38 billion km. In fact, there are times in Pluto’s orbit when Neptune passes it. Then Neptune really is the farthest planet from the Sun.

Because it is “tidally-locked” to the Earth. The Earth’s gravity slows down the moon’s rotation, so that it rotates at the same speed as it revolves around the Earth. Imagine a person who walks around a center pole, but shifts their body so they are always facing it as they walk.

Correct Option: C

Because it is “tidally-locked” to the Earth. The Earth’s gravity slows down the moon’s rotation, so that it rotates at the same speed as it revolves around the Earth. Imagine a person who walks around a center pole, but shifts their body so they are always facing it as they walk.