A group of scientists are studying observable matter in a cluster of galaxies. They conclude that the cluster has only a small percentage of the mass required to keep it from
flying apart. Why does the duster remain intact?

Answers

Answer 1

Answer:

it is because of Dark Matter

Dark Matter, component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity. Dark matter makes up 30.1 percent of the matter-energy composition of the universe; the rest is dark energy (69.4 percent) and “ordinary” visible matter (0.5 percent).

Dark matter is composed of particles that do not absorb, reflect, or emit light, so they cannot be detected by observing electromagnetic radiation. Dark matter is material that cannot be seen directly.

Explanation:

Hope It helps

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Answer 2

A group of scientists is studying observable matter in a cluster of galaxies. The duster remains intact due to the gravitational pull.

What is a galaxy?

A galaxy is a collection of stars, stellar remains, interstellar gas, dust, and dark matter that are gravitationally bonded together.

Dark matter is a component of the universe whose gravitational pull can be detected rather than its luminosity. The universe's matter-energy ratio is made up of 30.1 percent dark matter, 69.4 percent dark energy, and “regular” visible matter (0.5 percent).

Since dark matter is made up of particles that do not absorb, reflect, or emit light, it is impossible to identify it through electromagnetic radiation observation. Dark matter is a substance that cannot be directly observed.

Therefore, a team of researchers is examining the material that can be seen in a clump of galaxies. Due to the gravitational force, the duster is unharmed.

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Related Questions

Please Help! (Will mark brainliest)

How many chlorine atoms are in 4 moles of chlorine?

A sample of acetaminophen has 100,000 molecules in it.

Answers

Answer:

2.409*10^24

Explanation:

If I am not mistaken you are supposed to do 4*6.022*10^23. This will allow for it to be converted.

I hope this helped

Someone please help, I will give brainliest, I am desperate. NO LINKS!!!

Answers

Answer: A. 8.8%

Explanation:

Percent Error Formula: approximate error - actual value divided by actual value (Approximate-Actual/Actual). After those steps are completed, multiply by 100 to make it a percentage form.

0.365 - 0.400 = -0.035

-0.035 / 0.400 = 0.0875

0.0875 * 100 = 8.75%

8.75% rounded to the nearest tenth is 8.8%

Identify the correct chemical name.
Select one:
a. calcium (II) hydroxide
b. chromium hydroxide
c. ammonium calcide
d. ammonium chloride​

Answers

The answer is D ammonium chloride
The answer is a because calcium is a substance

Solve pls brainliest
The two green substances are not same thing because some of their properties are different and some of them are the same. If they were the same substance, all of their properties would have to be the same.


How could the explanation be improved?

Answers

Answer:

Even though the two substances possess many similarities, they have some unique properties. In turn, since they have the same properties, if they were the same substance, it would make matters worse, if the same chemical was in two different places, there would not be a difference between them since they are the same, just as it is with are two different chemicals would have differing properties since they are two properties would vary from one another since they are 2 totally different things!

.The 1" row of the periodic table has which two elements?

Answers

On the periodic table, hydrogen and helium are the only two elements in the first row, or period, which reflects that they only have electrons in their first shell. Hydrogen and helium are the only two elements that have electrons exclusively in the 1 s 1s 1s orbital in their neutral, non-charged, state.

According to the unbalanced equation above if 8.542 moles of oxygen gas reacts with an excess amount of hydrogen gas, how many grams of water is produced

Answers

Answer: 153.8865g?

Explanation:

What is Jupiter’s strength of gravity?

Answers

Answer: 24.79 m/s^2

Explanation: Jupiters surface gravity which is defined as the force of gravity at its cloud tops.

Of the elements listed, circle the one that will form the LARGEST ion:
Br, Zn, Ni, Cu, Fe, Mn

Answers

Zn is the step by step explanation

Who turned the ragged Continental Army into a more efficient fighting force?

Answers

Von Steuben turned the ragged Continental Army into a more effective fighting force by drilling and teaching the army discipline

7. Describe the difference between a genetically modified organism (GMO) and an unmodified organism.

Answers

Answer:

there

Explanation:

organic food is farmed and manufactured per the guidelines put forth by the Department of Agriculture. Organic food is typically pesticide-free, GMO-free, and sustainably farmed.

Non-GMO food, or non-genetically modified food, has not been altered or engineered in any way. Non-GMO food doesn’t necessarily adhere to the same guidelines that organic food does.

GMO food has been genetically modified in some form, usually in a laboratory.

Zn + Fe2O3 --> Fe + ZnO
If excess Zn reacts with 1.34g Fe2O3 in the reaction above, how many grams of Fe would you expect to be produced

Answers

The mass of Fe produced from the reaction is 0.938 g.

We'll begin by calculating the mass of Fe2O3 that reacted and the mass of Fe produced from the balanced equation.

3Zn + Fe₂O₃ —> 2Fe + 3ZnO

Molar mass of Fe₂O₃ = (56×2) + (16×3) = 160 g/mol

Mass of Fe₂O₃ from the balanced equation = 1 × 160 = 160 g

Molar mass of Fe = 56 g/mol

Mass of Fe from the balanced equation = 2 × 56 = 112 g

From the balanced equation above,

160 g of Fe₂O₃ reacted to produce 112 g of Fe.

Finally, we shall determine the mass of the Fe produced by 1.34 g of Fe₂O₃

From the balanced equation above,

160 g of Fe₂O₃ reacted to produce 112 g of Fe

Therefore,

1.34 g of Fe₂O₃ will react to produce = (1.34 × 112)/160 = 0.938 g of Fe

Thus, 0.938 g of Fe was produced from the reaction.

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What is one way humans can control landfills?
(25 Points)
They can throw away less garbage.
They can throw away more garbage.
They can pollute the land.
None of the above.

Answers

none of the above is the answer i think?!

Answer:

none of the above

Explanation:

if we threw away less garbage it would just end up polluting somewhere else

if we threw away more garbage it would just add to the landfills

and if we pollute the land any more than we already have there's no point in even trying

therefore the most logical answer would b none of the above

Write a balanced equation and name the products of the reaction CaCl2+Na3(PO4)

Answers

balanced equation - 3CaCl2 + 2Na3PO4 → Ca3(PO4)2 + 6NaCl

products - calcium phosphate and sodium chloride

Answer:

Ca3(PO4)2 + NaCl

Explanation:

calcium phosphate and sodium chloride

You would expect that a string of light that are set up in a series circuit would

Answers

You would expect that a string of light that are set up in a series circuit would

In the first half of the citric acid cycle, ____________ is oxidized, yielding a pair of electrons that reduce a molecule of NAD to NADH.

Answers

Answer:

isocitrate

Explanation:

1. What is the Speed equation?
a. S= D/T
c. A= Fv-lv/T
b. A= lv - FIT
d. S= T/D

Answers

Answer:

A

Explanation:

distance over time is speed's equation

Elements that are usually shiny and good conductors of heat and electricity are known as_______.

Points: 70

Answers

metals. the metals take up most of the periodic table left of the metaloid staircase and also exclude hydrogen

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Static electricity is a ____ charge.
A. permanent
B. missing
C. flowing
D. temporary

Answers

Hey there!

Static electricity is a missing charge. When positive ions are formed (where an electron is missing), this imbalance is called static electricity.

Answer: Static electricity is an imbalance of electric charges within or on the surface of a material. The charge remains until it is able to move away by means of an electric current or electrical discharge.


Olivia looked under a microscope and saw tiny protists moving around on the slide from water in a pond near her house. She remembered what she
had learned about the cell theory as she observed the protists moving. Which three ideas are included in the cell theory?
A New cells are produced from existing cells
B. Cells are the basic units of structure and function of living organisms
C Cells are the basic units of structure and function in animals only
D. Cells divide when they begin to grow too large to function
E All living things are made of cells
E Cells are able to divide and produce new materials
their daughter cells.

Answers

Answer:

She remembered what she had learned about the cell theory as she observed the protists moving. Which three ideas are included in the cell theory ..

Explanation:

Which statement correctly defines dynamic equilibrium?
At dynamic equilibrium, the rates of forward and reverse reactions are equal.
At dynamic equilibrium, the rate of the forward reaction is higher than the rate of the reverse reaction.
At dynamic equilibrium, the forward and reverse reactions stop.
At dynamic equilibrium, the concentrations of reactants and products are equal.

Answers

Answer: at dynamic equilibrium, the rates of forward and reverse reactions are equal.

Explanation:

The correct statement defines dynamic equilibrium "at dynamic equilibrium, the rates of forward and reverse reactions are equal."

What is dynamic equilibrium?

The state of a particular system wherein the reversible reaction takes place ceases modifying the ratio of reactants as well as products, but there is still a transfer of substances among the reactants and products is known as dynamic equilibrium.

What is reactions?

Chemical reaction can be defined as the a method for creating novel chemicals with unique features.

The correct statement defines dynamic equilibrium "at dynamic equilibrium, the rates of forward and reverse reactions are equal."

Therefore, the correct answer will be option (a).

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A sealed flask initially contains pure nitrogen dioxide gas (NO,). Over time, the nitrogen dioxide forms dinitrogen tetroxide gas (N,O.). The graph below shows the relative amounts of (NO,) and (N20.) over time. What is true about the time indicated by the blue arrow?

Answers

This problem is providing information about the equilibrium reaction whereby nitrogen dioxide gas produced dinitrogen tetroxide gas as shown on the attached picture and the following chemical equation:

NO₂ (g)  ⇄ N₂O₄ (g)

In such a way, we can consider the given choices to reason the following:  the blue arrow is pointing out the arrival to the equilibrium condition for the reaction, a point in which the rate of the forward reaction (formation of N₂O₄) is equal to the rate of the reverse reaction (formation of NO₂), because the molecules will fluctuate to the same relative amounts defined by the equilibrium constant.

Therefore the answer will be the first one on the attached file, which can vary on your online homework format.

It is important to note that the reactant is not used up at any point of the graph (concentration drops to 0) and also, the activation energy cannot be analyzed with this sparse information.

Learn more:

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using the two ways you have learned about between temperature, pressure and volume, what are two ways you could increase the gas pressure of a system.

Answers

Answer:

I don't know do you know tell me please

Which correctly lists three items that are removed during the purification of wastewater?
chemicals, gases, solids
debris, chemicals, solids
gases, debris, groundwater
groundwater, gases, harmful organisms

Answers

Answer: its the 3rd one

Explanation:

Answer:

gases, debris, groundwater.

Explanation:

if I'm wrong blame me.

hope it helps.

and can I have briniest

Arrange the gases from most dense to least dense at a given temperature and pressure.
Most dense
Least dense
Answer Bank
Ar
Ne
CO2
H
C12

Answers

Answer:

Arrange them in order of greatest to least Molar Mass to get most dense to least dense at a given temperature and pressure.

Explanation:

"Given Temperature and Pressure" just tells you that those two variables are being held constant. The Ideal Gas Law (PV = nRT) shows that n (the # of moles) and V (the volume) are variable still. To keep pressure constant, we need to increase the volume so that the force per area is the same which would unfortunately lower the density. The only way for a gas to have the greatest density would be to have the least average kinetic energy to keep the pressure constant at a smaller volume. This is because kinetic energy is equal to KE = 1/2 m v^2, where m is mass in kilograms and v is the velocity. IT IS CRUCIAL TO NOTE THAT ACCORDING TO KINETIC MOLECULAR THEORY, ALL GASES HAVE THE SAME AVG. KINETIC ENERGY WHEN AT THE SAME TEMPERATURE. So since the avg. KE is also constant across these answers due to the temp. being constant, our only way to decrease the velocity (the rate at which the particles are moving per second) and in turn the number of collisions (to repeat, a smaller number of collisions is desired because they are equal to the pressure that must maintained at a constant value at the smallest volume possible to achieve highest density possible) is to increase the molar mass. This is also pretty intutive for the other part of the issue: since Density is a broken heart (m/v), a higher molar mass would ensure a smaller pressure (due to decreased velocity) and smaller volume (due to constant pressure). Okay, now order the gases heaviest to lightest in terms of molar mass and you got your answer. Please gimme brainliest if this helped bc it took 15 minutes to type out. Hope this helped you! :D

Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. The order of density is carbon dioxide>Neon >argon>carbon-12> hydrogen.

What is density?

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.

Mathematically,

Density of gas  = Molar Mass of the gas  ÷volume occupied by the given gases

Density is directly proportional to molar mass of the gases.

Molar mass of argon = 18g/mole

Molar mass of Neon = 20g/mole

Molar mass of carbon dioxide=44.01 g/mol

Molar mass of hydrogen=1g/mol

Molar mass of carbon-12=12g/mol

The order of gases from most dense to least dense at a given temperature and pressure is carbon dioxide>Neon >argon>carbon-12> hydrogen.

Therefore, the order of density is  carbon dioxide>Neon >argon>carbon-12> hydrogen.

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2. Use the graph below to answer the following questions.
Does this graph represent an endothermic or an exothermic reaction?

How do you know this graph represents that type of reaction?

What is the potential energy of the reactants (PEreactants)?

What is the potential energy of the products (PEproducts)?

What is ΔH of the reaction?
REMEMBER: ΔH = PEproducts - PEreactants

What is the activation energy (Ea) of this reaction?
REMEMBER: Activation Energy = Maximum Energy - PEreactants

Answers

Answer:

The graph represents an endothermic reaction.

The products have more energy than the reactants.

80kJ

160kJ

80kJ

160kJ

The given graph is representing an endothermic reaction as the potential energy reactants are lower than that of the products.

ΔH of the reaction and activation energy is 80 KJ and 160 KJ respectively.

What is the endothermic process?

An endothermic process can be defined as a process with an increase in the enthalpy H of the system. An endothermic process involves an increase in the temperature of the system.

Whether a process occurs spontaneously depends not just on the enthalpy change but also on the entropy change and temperature.

From the graph, the potential energy of the reactants = 80 KJ

The potential energy of the products = 160 KJ

ΔH of the reaction, ΔH = PE(products) - PE(reactants)

ΔH = 160 -80 = 80 KJ

The activation energy (Ea) of this reaction will be:

Activation Energy (Ea) = Maximum Energy - PE(reactants)

Activation Energy = 240 - 80 = 160 KJ

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Use the pictures below to answer these questions: How does Magnesium become an ion? What is the charge of the Magnesium ion?

Answers

Answer:

Explanation:

The bottom picture shows a Mg atom. There are two electrons on the outside ring. When Mg reacts with something, these 2 electrons are given away. The top picture records that fact.

How did you use the tools in the sim that helped you decide if the atom had a positive, negative, or 0 charge?

Answers

Answer:

The atomic number on the Periodic Table will tell you how many protons are in the nucleus of each atom.

Explanation:

number of electrons and protons should be equal in a neutral atom. Because each electron has a -1 charge, and each proton a +1 charge, the number of each must be the same for the net charge to equal zero.

if you mix calcium hydrogen and carbon how many compounds will you have?

Answers

Answer:

Calcium monohydride is a molecule composed of calcium and hydrogen with formula CaH. It can be found in stars as a gas formed when calcium atoms are present with hydrogen atoms.Calcium carbonate is a chemical compound with the formula CaCO3 formed by three main elements: carbon, oxygen and calcium.

Explanation:

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When magnesium ium is left in moist air for several hours, the metal Sur face taanishes?why

Answers

Answer:

due to the formation of an oxide or hydroxide layer

Explanation:

magnesium is a reactive metal...when left in air it reacts with oxygen to form an oxide layer of MgO and it can react with moisture to form Mg(OH)2 LAYER ON THE SURFACE.

Circle the compound below that does not contain an alkaline earth metal.
Ca(OH)2, Sro, Mg3N2, NaOH, MgCl2, Bas

Answers

NaOH.

Na = Sodium which is in group 1 of periodic table which are alkaline metals. all the others are alkaline earths as they are all in group 2.

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Give proof that mass is constant and weight keeps changing. estimate the area of the following irregular shapes the new bag had been bought by karan from the market change it into active voice Mary had 60$ and spent 3/4 on a coat. plus she brought a skirt with 1/2 she had left . how much do she have left? If an input force of 202N is applied to the handles of the wheelbarrow in the sample problem how large is the output force that just lifts the load? a joker cap is in the form of a right circular cone of base radius 10.5cm and height 36cm. find the area of sheet to make 20 such caps....?plz answer this Which of the following have a sum of 0? (Pick 2) *1:The football team gained 10 yards on the first play, gained 10 yards on the second play, and lost 10 yards on the third play. What was the overall change in yardage?2: While playing the integer game, Sam pulled the following cards: 8, 4, 5, -6, -8, -3. What is the sum of Sam's hand?3: -15 - 8 + 12 + 114: 6 + (-5) - 7 + (-4) + (-4) You can protect yourself from identity theft by using ____ when transmitting information over network connections. a. cookies b. port-scanning c. biometrics d. encryption Why doesnt people like me? help me please and thanks Plsssssssssss helppppppp d.One rectangle weighs what someone solve asap whats the answer for this Las Funciones de los cuerpos animalesProyecto en equipo. 20 puntosNombre del animal:Familia:_(Reptil/Carnivoro/Erbivoro)Donde viven:Ciclo de la vida delanimal:Tamano:Colores:Caracteristicasnicas:Supervivencia/ Quecomen:Que aparatos / sistemas usan: (Eje Aparato respiratorio, sistema nerviosos) Puedes usartus notas para contestar esta preguntaDatos extra INTERESANTES sobre este animalAprendiste algonuevo?DIBUJA: Recuerda que tienes que hacer un diagrama en donde muestres el ciclo delanimal que hayan escogido en grupo. A quadrilateral has two angles that measure 200 and 30. The other two angles are in aratio of 6:7. What are the measures of those two angles? What is the perimeter?6 yards8 yards4 yards Pastor Joe sneaked into the office. He had to get his hands on the money that was collected to fix the church roof. He needed to increase his bank accounts by the hook or by the crook. ____________ *1 point(a) Alliteration(b) irony(c) personification(d) irony 20 points if you answer Which of the following is true of judges and justices in the federal court system?a) They are part of a seniority system that gradually moves them toward the Supreme Court.b)They are elected by the people every ten years.c)They are appointed by the president with the advice and consent of the House of Representatives.d)They are appointed by the president with the advice and consent of both houses of Congress.e)They are appointed by the president with the advice and consent of the Senate. explain the significant of bonds in the 1760 and 1790