Quasar distances are estimated by   a. their redshifts.   b. parallax.   c. the Tully-Fischer relationship.   d. the mass-luminosity relation.   e. Cepheid measurements

Q: Is there a reliable way to standardize the measurement of wave size or surface conditions at sea?

A: Waves are the result of wind actions that affect the ocean surface resulting in the wave actions. Wa...

Q: Please define what is smart city by using the application of information technology and suggest five...

A: The smart-city is an urban-area concept is based-on the use of electronic sensors that collect-data ...

Q: What do we mean when we say something is dense?

A: Volume of a matter or substance is quantity in a three-dimensional space which is close by some surf...

Q: Why is the Sandy Hook lighthouse is so far away from the water's edge?

A: The Earth essentially exists in a dynamic state. Many processes operate in its system, such as const...

Q: What are the visible differences between spiral and elliptical galaxies?

A: Galaxy- A galaxy is a gravitationally bounded system of astronomical bodies A galaxy is a huge syste...

Q: What evidence is there that an asteroid struck Earth at the end of the Cretaceous Period?

A: An asteroid of relatively big size struck on the earth at the end of the Cretaceous period, which is...

Q: The _____________________ are places in the orbital plan of a binary star system where a bit of matt...

A: In the case of the binary star system,the two stars orbit around a common centre of mass.  Almost 85...

Q: What makes RR Lyrae variables different from Cepheid variables?

A: Cepheid stars and RR Lyrae stars are the two most variable stars. Cephaid stars has a period of 2 to...

Q: This map shows the continents as they appear on Earths surface today. It would be correct to say tha...

A: Earth is a terrestrial planet, meaning it has a rocky surface primarily made up of silicate rocks an...

Q: Which is NOT a good distance indicator for galaxies?   a. globular clusters   b. type Ia sup...

A: Galaxy- A galaxy is a gravitationally bounded system of astronomical bodies A galaxy is a huge syste...

Q: What is the difference between a spiral galaxy and an elliptical galaxy?

A: A galaxy is a system of stars, stellar remnant, interstellar gas, dust and dark matter. solar system...

Q: What is the role of land capability classification in Soil and water conservation?

A: Soil is an essential part of the earth’s environment for plants to grow and perish also water the mo...

Q: A star will experience a helium flash if   a. it is more massive than about 6 solar masses.  ...

A: A helium flash is an extremely short warm rampant atomic combination of huge amounts of helium into ...

Q: As a star exhausts hydrogen in its core, it   a. becomes hotter and more luminous.   b. beco...

A: The universe is all the time and space that includes all the galaxies, stars, planets, and all forms...

Q: A _________________ generally contains considerably more than 1,000 galaxies and is quite dense. Suc...

A: Stars are one of the most important parts of the universe and are at the center of the galaxies. The...

Q: The method of finding galactic mass by measuring the radial velocities within a cluster is   a. ...

A: The double galaxy method is not used to determine the galactic mass by measuring the radial velociti...

Q: When do El Niño and La Niña usually happen?

A: The EL-Nino and La Nina are episodes of 9-12, months and tend to form during the spring and reach pe...

Q: Synchrotron radiation is produced by   a. objects with temperature below 10,000 K.   b. high...

A: The electromagnetic energy emitted by the charged particles moving ata high speed is known as Synchr...

Q: Explain how the theory of plate tectonics account for the changes in landform areas over geologic ti...

A: Firstly, let us discuss something about what exactly is plate tectonics? Plate tectonics: The theory...

Q: What is the chance that stars from two interacting galaxies will collide?   a. almost certain ...

A: The average distance between two stars of two interacting galaxies is about 160 billion km. The star...

Q: Mountain range Continental crust Continental crust Lithosphere Lithosphere Asthenosphere Ancient oce...

A: Earth is a terrestrial planet, meaning it has a rocky surface primarily made up of silicate rocks an...

Q: What are the characteristics of the semiarid climate of the Columbia Basin? Check all that apply. [...

A: The Columbia basin is located in the northwest region of the USA. It is an intermontane region, loca...

Q: As the ancestors of plants moved from water to land, they faced new problems and new advantages in t...

A: Earth is the third planet in the solar system. It formed almost 4.5 billion years ago. It is the onl...

Q: How will the sun end its life?   a. as a red dwarf   b. as a white dwarf   c. as a nova ...

A: Stars are astronomical objects with a luminous spheroid of plasma that is held together by the actio...

Q: Which is NOT a good distance indicator for galaxies?   a. planetary nebulae   b. type Ia sup...

A: Red dwarfs are the coolest and smallest stars on the main sequence. They are small, low surface temp...

Q: What are some advantages and disadvantages of large hydroelectric dams?

A: Hydroelectricity is produced when water is made to flow or fall from a great height on the ground wh...

Q: Compared to open star clusters, globular clusters tend to be   a. richer in metals and younger. ...

A: The universe is all the time and space that includes all the galaxies, stars, planets, and all forms...

Q: True or False 1. To bring about a fusion reaction, the reacting nuclei must be brought very close to...

A: Nuclear fusion is a response where at least two nuclear cores are consolidated to shape at least one...

Q: The event horizon   a. is believed to be a singularity.   b. is a crystalline layer.   c....

A: Event horizon is a boundary which marks the limit to which or beyond which an event cannot affect. I...

Q: Explain why Cepheid variables are considered “standard candles.”

A: Cepheid variables are the stars that pulsate with a frequency proportional to their absolute magnitu...

Q: The Chandrasekhar limit tells us that   a. accretion disks can grow hot through friction.   b...

A: Ever since the beginning of the Universe, matter and energy were created. These matters and energy e...

Q: Label the microscope

A: Earth science is the study of the Earth and the various processes that are going on in the Earth sys...

Q: If a stellar remnant is less than 0.08 solar masses, the resulting object will be a   a. brown d...

A: The stellar object, which has mass less than 0.08 solar masses has not sufficient energy to go for f...

Q: Planetary nebulae are viewable on the order of   a. years.   b. thousands of years.   c. ...

A: A star is an extra-terrestrial astronomical body that radiates its own energy due to the nuclear rea...

Q: True or False    1. In Darcy's Law, K is a parameter known as hydraulic conductivity that takes into...

A: Darcy’s law is a law which describe the fluid flow through a porous medium. It was developed by Henr...

Q: If nothing can escape from a black hole, not even light, how do black holes emit X-rays?

A: Blackhole is a place in space where the gravitational pull is very high that even light cannot get o...

Q: How does a sanitary landfill differ from an open dump?

A: Landfill are places where waste material is kept, usually away from human population. This waste is ...

Q: What are the functions of soils in a rice field, and suggest management activities to maintain a hea...

A: Rice is one of the main staple food in the world. Since thousands of years, rice has been cultivated...

Q: The radio lobes that flank some radio galaxies produce mainly   a. 21-cm radiation.   b. syn...

A: Ever since the beginning of the Universe, matter and energy were created. These matters and energy e...

Q: All __________________ galaxies are spiral galaxies that have small luminous nuclei.   a. active...

A: A galaxy is a system or body of stars, stellar remnant, interstellar gas, dust and dark matter. sola...

Q: Describe the basis for the Shapley–Curtis debate.

A: The Milky Way is the world that contains our Close planetary system, with the name portraying the un...

Q: Explain what causes some stars to produce novae.

A: A star is an extra-terrestrial astronomical body that radiates its own energy due to the nuclear rea...

Q: What is the greenhouse effect? *       a. Certain gases in the atmosphere trap heat...

A: The atmosphere on and around the earth is made up of a variety of gases that are present in specific...

Q: Explain what causes the temperature to increase with height through the stratosphere, and decrease w...

A: The temperature through the atmosphere was determined by the gas constituents in it. The temperature...

Q: What’s convergent evolution?

A: Firstly, let us discuss something related to convergent, Convergent: coming closer together  

Q: Low land areas such as Parit Karjo has the soil which water table is near the ground surface. The pr...

A: The lowland soils address the weighty utilization of our territory assets being effectively availabl...

Q: Choose a landslide event from the past 3 months. Write a paragraph describing - the type of mass was...

A: On April 26, 2021, 04:53 Indian Standard Time (IST), a landslide occurred in Lahaul’s Udaipur, Himac...

Q: Which of the following is NOT a characteristic of the stars of the disk component of our galaxy? ...

A: The universe is all the time and space that includes all the galaxies, stars, planets, and all forms...

Q: The most spherical elliptical galaxies would be classified as   a. E0.   b. E3.   c. E5....

A: In Hubble classification, E0 galaxy is most spherical because for it, the major axis is equal to its...

Q: The increasing price of oil triggered by the ship incident in Suez Canal has caused the problem in g...

A: Natural resources are materials that come from the Earth and are used to support life and meet human...