A galaxy lies one giga-parsec from the Earth. Directly behind it, and two giga-parsecs from the Earth is a quasar. The gravity lenses the quasar light so that the quasar appears as a ring of radius one arc-second around the galaxy, as viewed from the Earth (a so-called "Einstein Ring"). What is the mass of the galaxy?

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A: According to the physical geography, America is divided into three as North America, South America a...

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A: True or False: A strike-slip fault has a vertical slip component.

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A: If you had a cooling magma chamber with material from the above diagram, and as it cools the materia...

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A: Geological events is an  recognizable occasion during which at least one geographical cycles act to ...

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Q: Why do the ones in ice and snowy areas experience higher change in temperature than ones who are in ...

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Q: What do you think happen if the plate tectonics did not separate?

A: Plate tectonics define how major landforms are made because of Earth's underground developments. ......

Q: an blow out take underground (below the earth). Answer yes or no?

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

Q: Differentiate water table well and artesian well.

A: An artesian well is a type of natural opening in the earth's crust from which groundwater flows outs...

Q: ᴀᴄᴛɪᴠɪᴛʏ ₁: ᴄʀᴜꜱᴛᴀʟ ᴅᴇꜰᴏʀᴍᴀᴛɪᴏɴ ᴅɪʀᴇᴄᴛɪᴏɴꜱ: ᴡʀɪᴛᴇ ᴛʀᴜᴇ ɪꜰ ᴛʜᴇ ꜱᴛᴀᴛᴇᴍᴇɴᴛ ɪꜱ ᴄᴏʀʀᴇᴄᴛ ᴀɴᴅ ɪꜰ ɴᴏᴛ, ᴡʀɪᴛᴇ...

A:  Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question and ...

Q: The energy debate: Renewable energy cannot replace fossil fuels

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A: Earth is divided into four major layers based on composition: the crust, the mantle, the outer core ...

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A: What are some problems associated with applying very high levels of farm manure wastes to soils?

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A: Groundwater defines the water that happens underneath the outer layer of Earth, where it involves al...

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Q: Complete the first worksheet

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Q: The longest wavelength of light humans can see is around 750 nm, deep red. If w were to observe a gr...

A: The longest wavelength of light humans can see is around 750 nm, deep red. If we were to observe a g...

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A: A rock is an aggregate of minerals. Based on the mineral composition and the environment, a rocks ca...

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A: After some time, the residue stack up to frame level layers of sedimentary rocks. The base layer of ...

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A: Given the accompanying estimations of mean breezes and temperature from a 200-m pole in the Netherla...

Q: How can habitat loss and pollution affect animals

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A: A mineral is a normally happening inorganic component or mixing having an. Deliberate inside constru...

Q: 3. What is human geography?

A: Geography is a science that studies spatial features as a whole. The term "geography" refers to the ...

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A: Meteorology is defined as the study of earth's atmosphere and the variation in the temperature along...

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A: There are processes that are destructive, there are processes that are constructive, and these proce...

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Q: Muav Limestone H Bright Angel Shale Tapeats Sandstone Nankoweap Group Youngest Chuar Shales Dox Sand...

A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question s...

Q: The ancient Greeks were able to calculate the distance from the Earth to the Moon by measuring Selec...

A: There are many ways to measure the distance of the Moon from the Earth.

Q: What do you think is the basis of scientists in dividing Earth's lithosphere into several plates?

A: The outer shell of the earth consists of denser oceanic crust and lighter continental crust and whic...

Q: Select the statement that is true. O UHI is local effect of global climate change. Because cities co...

A: Environment corresponds to the surrounding in which all the living and non living organisms reside a...

Q: 9. The first theory of continental drift was proposed by a. Alfred Wegener b. John Tuzo Wilson c. W,...

A: According to the plate tectonics theory, the surface of the Earth is made up of various hard lithosp...

Q: Consider the agricultural sector's relevance to Africa's economic growth.

A: Rural modernization gets ready conditions for industrialization by supporting work efficiency, expan...