Astronomers frequently say that “there are more stars in the universe than there are grains of sand on all the beaches on the earth”. Given that a typical grain of sand is about 0.5 – 1.0 mm in diameter, estimate the number of grains of sand on all the earth’s beaches. The diameter of the Earth is 12,742 km. About 1011 About 1016 About 1021.

Q: What were the roles of new thoughts/ideas regarding the universe and new developments in the…

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Q: When was universe was created

A: Big Bang theory: This give the information about how universe began. According to Big Bang theory "…

Q: Some thing that is 50 km away has an angular size of five arc seconds how tall is the object write…

A: Angular size, θ = 5 second of arc Distance, r = 50 km = 50×103 m Consider height is h.   First…

Q: Recall that Hubble’s Law is given by V=HR; this means that H has units of inverse seconds (1/sec).…

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Q: Explain why is it reasonable for them to believe that the earth was the center of the universe.

A: Explain why is it reasonable for them to believe that the earth was the center of the universe.

Q: 5 terms listed below, You must include the term, a description of the term in your own words (to…

A: Everything that exist is universe. Given five terms can be described as below

Q: how everything in the universe come to exist?   list the different theories on the origin of the…

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Q: ccording to modern science, the age of the universe is about         a. 6,000 years   b.  14…

A: Question asked : Age of the universe, according to the modern science

Q: If our universe is expanding, what are the implications for the separation between two stars within…

A: C. The distance between the two stars is unaffected

Q: A certain triple-star system consists of two stars, each of mass m, revolving in the same circular…

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Q: The presence of an unseen planet orbiting a distant star can sometimes be inferred from the motion…

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Q: How many parsecs are there in 212 light-years?

A: We know that 1 light year = 0.3066 parsecs

Q: around them. в 3 10 15 20 25 Time (years) Time (years) C Time (years) Time (years)

A: Kepler’s Third law of planetary motion: According to Kepler’s third law of planetary motion, the…

Q: Our Solar System is about 8.3 kpc from the centre of our galaxy. Using Newton's Universal…

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Q: Another way of explaining a word is to enumerate the different parts of which it is made: “X…

A: The Solar system consists of our star, i.e. the Sun, and planets and heavenly bodies which are…

Q: Astronomers frequently say that “there are more stars in the universe than there are grains of sand…

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Q: The Drake Equation is a tool for estimating ...    A)  the number of alien civilizations…

A: Drake equation is a speculative equation which gives an approximate number of extra-terrestrial…

Q: How many atomic nuclei (diameter = 1 × 10¬1 cm) would it take to stretch from one end of the known…

A: diameter of atomic nuclei (d) = 10-13 cm = 10-15 m distance of one end of universe to its other end…

Q: A giant structure with billions of stars and sometimes gas and dust is called a O galaxy O star…

A: Galaxy

Q: 4 2.

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Q: 2. Over several months an astronomer observes an exoplanet orbiting a distant star at a distance of…

A: We have, T=2πRvv=GMstarR T=3.875 years =3.875×365×24×60×60 seconds =122202000 secondsR=5.934 AU…

Q: Compare the values of the number of grains of sand in all earth’s beaches with the number of stars…

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Q: What is the distance in light years (ly) to Alkaid? 12 ly 104 ly 55 ly 4 ly

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Q: A planet orbits a star in a different stellar system The mass of the planet is 2 times Jupiter's…

A: This question is about to find gravitational force between star and planet in compare to…

Q: Which is a scientific hypothesis? Select one: a.atoms are the smallest matter particles b.the…

A: Meaning of hypothesis is presumption or supposition. A scientific hypothesis is that presumption or…

Q: Kessel Run. A parsec (pc) is a unit of length equivalent to [pc] = 3.09 x 1016 [m] and an…

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Q: Make a web search and explain in your own words a method to measure distances in universe.

A: There are different methods to measure distances in universe.

Q: Our sun was born approximately 4.6 billion years ago. How many journeys around the centre of our…

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Q: longer than the length of r

A: given, Length of the recorded history = 1011 s Age of the universe = 1018s let length of the…

Q: The sun orbits the center of the Milky Way galaxy for a period of 2.5x10^8 years. (a) Assuming a…

A: Given  time period of rotation = 2.5 x 108 years  Radius of orbit =2.4 x 1020 m

Q: Stars are spherical in shape. A star has a diameter of 77 x 1010 m. How many earths could fit inside…

A: The volume of a sphere can be given as, Here, R is the sphere’s radius. In terms of diameter, the…

Q: Indicate whether the following statements are true or false. (Select T-True, F-False. If the first…

A: Since your question has multiple-subparts, we will solve the first three sub-parts for you. If you…

Q: A spaceship is traveling through deep space towards a space station and needs to make a course…

A: Solution:                                  Ax =2.3×106Ay = 0Bx = 1.5×106 cos 70°By = 1.5×106 sin…

Q: Reduce the following astronomical equations to proportionalities. Then, indentify how the left hand…

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Q: In a binary star system, the average separation between the stars is 5 AU and their orbital period…

A: The separation between the stars, a=5 AU The  orbital period, T=4 years The sum of the stars'…

Q: The distance unit best for interstellar distances is the light-year. ___   The distance unit best…

A: light year is distance travelled by light in 1 year and is used to measure interstellar distance. so…

Q: Put in order from least to greatest the following terms: galaxy, planet, moon, sun, solar system,…

A: We have put in order the given terms. The order has to be in least to greatest.…

Q: Using the data in the table below and the appropriate conversion factors, find the mean distance to…

A: From the given table, the mean distance to the Moon is,

Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.