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Home Q & A Board Science-Related Homework Help Physics Astronomy
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Consider a spacecraft that travels round-trip to the zeta reticuli star system (distance 39.5 ...
Consider a spacecraft that travels round-trip to the zeta reticuli star system (distance 39.5 ...
Consider a spacecraft that travels round-trip to the zeta reticuli star system (distance 39.5 light-years) at 99% of the speed of light. If the round-trip travel time as measured from Earth is 79.8 years, how much time would pass for passengers on th
adreamer   689   2 Replies
Anonymous
2 days ago
Balloon's in Space and Mars planet.
Balloon's in Space and Mars planet.

https://en.wikipedia.org/wiki/Boyle%27s_law

https://en.wikipedia.org/wiki/Charles%27s_law


What will be the impact of a Balloon in Space within and outside an Manned Spacecraft?

Can the Boyle's and Cha
prashantakerkar   156   1 Reply
7 months ago
The NASA Curiosity rover exploring Mars carries a number of scientific instruments, including a ...
The NASA Curiosity rover exploring Mars carries a number of scientific instruments, including a ...
The NASA Curiosity rover exploring Mars carries a number of scientific instruments, including a spectrograph (a device for recording a spectrum), and a high intensity laser. On several occasions, Curiosity has fired its laser at the surface of a rock
Nikky.05   261   2 Replies
A year ago
Mars planet exploration.
Mars planet exploration.

https://en.wikipedia.org/wiki/List_of_ultralight_helicopters

As part of Mars planet exploration, could there be aviation i.e. airplanes, helicopters flights possible on the planet?

Can customised ultralight helicopters be
prashantakerkar   169   1 Reply
A year ago
Why is dark matter called "dark matter"?
Why is dark matter called "dark matter"?
Why is  dark matter called "dark matter"?
      
a. It does not interact strongly with light, but it does have gravity like other matter.
      
b. It absorbs all light and exerts gravity.
      
c. It is made from bl
Charlie Lem   134   1 Reply
A year ago
Based on current evidence, which of the following is the most likely candidate to make up the maj…
Based on current evidence, which of the following is the most likely candidate to make up the maj…
Based on current evidence, which of the following is the most likely candidate to make up the majority of dark matter?
      
a. Faint red stars
      
b. Black holes
      
c. Jupiter-size objects
      
d. Brown dwarfs
Charlie Lem   152   1 Reply
A year ago
How did Edwin Hubble measure the distance to the Andromeda Galaxy?
How did Edwin Hubble measure the distance to the Andromeda Galaxy?
How did Edwin Hubble measure the distance to the Andromeda Galaxy?
      
a. He measured its parallax.
      
b. He used white dwarf supernovae in the Andromeda Galaxy.
      
c. He deduced it from its redshift.
      
d. He u
Astronomy   141   1 Reply
A year ago
Why are Cepheid variables important?
Why are Cepheid variables important?
Why are Cepheid variables important?
      
a. Cepheid variables are stars that vary in brightness extremely rapidly as they rotate on their axes.
      
b. Cepheids are a type of young galaxy that helps us understand how galaxies form.
Astronomy HW   140   1 Reply
A year ago
Nearly all galaxies contain Cepheid variable stars. Why, then, do we determine the most distant…
Nearly all galaxies contain Cepheid variable stars. Why, then, do we determine the most distant…
Nearly all galaxies contain Cepheid variable stars. Why, then, do we determine the most distant galaxy distances using white dwarf supernovae rather than Cepheids as standard candles?
      
a. White dwarf supernovae can be detected with a sing
Astronomy HW   236   1 Reply
A year ago
In astronomy, a standard candle is an object with a known ________.
In astronomy, a standard candle is an object with a known ________.
In astronomy, a  standard candle is an object with a known ________.
      
a. luminosity
      
b. distance
      
c. surface temperature
      
d. apparent brightness
Astronomy HW   132   1 Reply
A year ago
How do we know that pulsars must be very small in size (radius)?
How do we know that pulsars must be very small in size (radius)?
How do we know that pulsars must be very small in size (radius)?
      
a. Only very small objects can beam radiation into space.
      
b. Some spin so rapidly that if they were larger in size, their surfaces would be moving faster than
Charlie Lem   135   1 Reply
A year ago
How does a black hole form from a massive star?
How does a black hole form from a massive star?
How does a black hole form from a massive star?
      
a. During a supernova, if a star is massive enough for its gravity to overcome neutron degeneracy of the core, the core will be compressed until it becomes a black hole.
      
b. If
Charlie Lem   121   1 Reply
A year ago
Which of the following is most likely to undergo a white dwarf supernova?
Which of the following is most likely to undergo a white dwarf supernova?
Which of the following is most likely to undergo a white dwarf supernova?
      
a. A main-sequence star like our Sun
      
b. A close binary system in which both stars are white dwarfs
      
c. A main-sequence star of spectral ty
Charlie Lem   139   1 Reply
A year ago
Specifications for Crewed mission spacecrafts in terms of interior and exterior paint colours.
Specifications for Crewed mission spacecrafts in terms of interior and exterior paint colours.
Are there specifications for Crewed mission spacecrafts in terms of interior and exterior paint colours? I.e. Only specific paint colours are required internally and externally.

Can these paint colours be changed as part of maintenance and
prashantakerkar   154   N/A
A year ago
Where do stars form and why?
Where do stars form and why?
Where do stars form and why?
      
a. Stars form in cold gas clouds because gravity has to be stronger than gas pressure.
      
b. Stars form around giant planets because planets provide the "seeds" of star formation.
      
Charlie Lem   122   1 Reply
A year ago
How does a white dwarf compare to a main-sequence star of the same mass?
How does a white dwarf compare to a main-sequence star of the same mass?
How does a white dwarf compare to a main-sequence star of the same mass?
      
a. The white dwarf has lower luminosity but higher surface temperature.
      
b. The white dwarf has higher surface temperature and higher luminosity.
   
Charlie Lem   126   1 Reply
A year ago
About what is the smallest mass a newborn star can have?
About what is the smallest mass a newborn star can have?
About what is the smallest mass a newborn star can have?
      
a. The mass of the Sun
      
b. 0.08 times the mass of the Sun
      
c. 0.01 times the mass of the Sun
      
d. 0.8 times the mass of the Sun
      
e. T
Charlie Lem   109   1 Reply
A year ago
How does a red giant compare to a main-sequence star of the same mass?
How does a red giant compare to a main-sequence star of the same mass?
How does a red giant compare to a main-sequence star of the same mass?
      
a. The red giant has lower surface temperature and lower luminosity.
      
b. The red giant has higher surface temperature and higher luminosity.
      
Charlie Lem   113   1 Reply
A year ago
How will the Sun end its life?
How will the Sun end its life?
How will the Sun end its life?
      
a. As a white dwarf supernova
      
b. As a white dwarf
      
c. As a neutron star or black hole
      
d. As a massive star supernova
Charlie Lem   110   1 Reply
A year ago
Double deck Spacecraft Design and construction.
Double deck Spacecraft Design and construction.

https://en.wikipedia.org/wiki/Double-deck_aircraft

Similar to Double Deck Aeroplane, a Double Deck Crewed mission spacecraft can be designed and constructed?

Benefits : More number of Astronauts in the Manned mission space
prashantakerkar   112   N/A
A year ago
Predictions for Extra-solar Planets: What predictions does the solar nebula theory make regarding ...
Predictions for Extra-solar Planets: What predictions does the solar nebula theory make regarding ...
Predictions for Extra-solar Planets: What predictions does the solar nebula theory make regarding possible planetary systems surrounding other stars? Discuss at least two such predictions that have been strongly confirmed by observations. Explain how
James89   678   3 Replies
A year ago
What keeps the Sun's outer layers from continuing to fall inward in a gravitational collapse?
What keeps the Sun's outer layers from continuing to fall inward in a gravitational collapse?
What keeps the Sun's outer layers from continuing to fall inward in a gravitational collapse?
      
a. Electromagnetic repulsion between protons
      
b. Neutrinos produced by nuclear fusion drag gas outward.
      
c. Outwar
Charlie Lem   139   1 Reply
A year ago
Why do sunspots appear dark?
Why do sunspots appear dark?
Why do sunspots appear dark?
      
a. They are composed of different elements than the rest of the sun.
      
b. They are regions that are significantly cooler than the rest of the photosphere.
      
c. They are regions nearly de
Charlie Lem   139   1 Reply
A year ago
What two forces are balanced in what we call gravitational equilibrium?
What two forces are balanced in what we call gravitational equilibrium?
What two forces are balanced in what we call  gravitational equilibrium?
      
a. The electromagnetic force and gravity
      
b. The strong force and kinetic energy
      
c. The strong force and gravity
      
d. Outwa
Charlie Lem   118   1 Reply
A year ago
What temperature is required to fuse hydrogen?
What temperature is required to fuse hydrogen?
What temperature is required to fuse hydrogen?
      
a. Thousands of Kelvin
      
b. Millions of Kelvin
      
c. Trillions of Kelvin
      
d. Billions of Kelvin
      
e. Any temperature, as long as gravity is strong
Charlie Lem   114   1 Reply
A year ago
Human Spaceflight - Maximum count of Astronauts onboard.
Human Spaceflight - Maximum count of Astronauts onboard.

https://en.wikipedia.org/wiki/Human_spaceflight

Human Spaceflight - Maximum count of Astronauts onboard till date. Human Spaceflight

Till date, In Manned Spaceflights how many is the maximum number of Astronauts were onboa
prashantakerkar   118   N/A
A year ago
Why is the sky blue?
Why is the sky blue?
Why is the sky blue?
      
a. The gases in Earth's atmosphere emit blue light.
      
b. The Sun mainly emits blue light.
      
c. The atmosphere transmits mostly blue light.
      
d. Because of the way light is reflec
Charlie Lem   123   1 Reply
A year ago
Refer to the figure. What can you conclude from the data shown on this graph alone?
Refer to the figure. What can you conclude from the data shown on this graph alone?
Refer to the figure. What can you conclude from the data shown on this graph alone?

a. The carbon dioxide concentration varies naturally, but is much higher today than it has been in the past 800,000 years.
      
b. Human activity h
Charlie Lem   108   1 Reply
A year ago
What is the main factor that makes Earth more geologically active than the other terrestrial…
What is the main factor that makes Earth more geologically active than the other terrestrial…
What is the  main factor that makes Earth more geologically active than the other terrestrial planets?
      
a. It has far more radioactive material than other planets.
      
b. It is larger, so it has retained its internal heat fo
Charlie Lem   106   1 Reply
A year ago
A microwave telescope “sees” microwave light coming from all directions in the sky…
A microwave telescope “sees” microwave light coming from all directions in the sky…
A microwave telescope “sees” microwave light coming from all directions in the sky.  This microwave signal is fairly strong, accounting for about 1% of the “noise” detected by a television antenna set “off channel.”  A plot of the relativit
Charlie Lem   134   1 Reply
A year ago
Astronauts landing on Mars planet.
Astronauts landing on Mars planet.

When will the Crewed space mission for Mars exploration event taking place in future?

Do you feel that in case life exists for survival on Mars planet, the future generations may actually visit and stay there for many years?
prashantakerkar   145   N/A
A year ago
If you want to see the image formed by a telescope, you should place your eye at the location of…
If you want to see the image formed by a telescope, you should place your eye at the location of…
If you want to see the image formed by a telescope, you should place your eye at the location of the telescope's ________.
      
a. focus
      
b. Cassegrain
      
c. secondary mirror
      
d. primary mirror
      
Charlie Lem   420   1 Reply
A year ago
Earth's atmosphere is most transparent to all wavelengths of ________ light.
Earth's atmosphere is most transparent to all wavelengths of ________ light.
Earth's atmosphere is most transparent to all wavelengths of ________ light.
      
a. ultraviolet
      
b. x-ray
      
c. infrared
      
d. visible
      
e. both visible and ultraviolet
Charlie Lem   146   1 Reply
A year ago
Are cosmic rays a form of light?
Are cosmic rays a form of light?
Are  cosmic rays a form of light?
      
a. Yes, they are light waves with lower energy than radio waves.
      
b. Yes, they are the name we give to all rays of light that come from the cosmos.
      
c. Yes, they are light wa
Charlie Lem   112   1 Reply
A year ago
Astronomers sometimes make use of "neutrino telescopes," which are typically located ...
Astronomers sometimes make use of "neutrino telescopes," which are typically located ...
Astronomers sometimes make use of "neutrino telescopes," which are typically located deep underground. What are  neutrinos?
      
a. A very low-energy form of light
      
b. A type of wave predicted to exist by Einstein&#
Charlie Lem   153   1 Reply
A year ago
Why can't we see radio waves?
Why can't we see radio waves?
Why can't we see radio waves?
      
a. Radio waves have too low energy to be detected by any means.
      
b. We do see radio waves, but we interpret them as the color red.
      
c. Radio waves fade away before they can reach
Charlie Lem   127   1 Reply
A year ago
An electron in an atom can go from a lower energy level to a higher energy level if the atom _____.
An electron in an atom can go from a lower energy level to a higher energy level if the atom _____.
An electron in an atom can go from a lower energy level to a higher energy level if the atom ________.
      
a. absorbs a photon of a specific wavelength
      
b. absorbs a photon of any wavelength
      
c. emits a photon of a sp
Charlie Lem   126   1 Reply
A year ago
We can see the Moon because it ________.
We can see the Moon because it ________.
We can see the Moon because it ________.
      
a. emits visible light
      
b. emits thermal radiation
      
c. reflects visible light
      
d. reflects infrared light
      
e. glows through radioactive decay
Charlie Lem   113   1 Reply
A year ago
You observe an object to be moving in a straight line at a constant speed. What can you conclude?
You observe an object to be moving in a straight line at a constant speed. What can you conclude?
You observe an object to be moving in a straight line at a constant speed. What can you conclude? (Assume the object does not have any engines or other power source.)
      
a. The only force acting on the object is gravity.
      
b. No
charley C   112   1 Reply
A year ago
Is there any place on Earth where we can see stars rise in the west and set in the east?
Is there any place on Earth where we can see stars rise in the west and set in the east?
Is there any place on Earth where we can see stars rise in the west and set in the east (rather than rising in the east and setting in the west)? Why or why not?
   
A. Yes, in the Southern Hemisphere, because the sky appears backward there
charley C   184   1 Reply
A year ago
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