402 Answered Questions for the topic astronomy

Astronomy

05/17/21

Distinguish between spiral galaxies and elliptical galaxies and describe one of each that has been viewed by HST.
Distinguish between spiral galaxies and elliptical galaxies and describe one of each that has been viewed by Hubble Space Telescope.
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Astronomy

05/17/21

The last servicing mission to HST; when it occurred, what was done (briefly!), and why it almost didn’t happen at all.

The last servicing mission to Hubble Space Telescope; when it occurred, what was done (briefly!), and why it almost didn’t happen at all.
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Astronomy

05/17/21

The year Hubble Space Telescope was launched; the serious flaw that was discovered when it began to send data; and how and when this flaw was fixed.
The year Hubble Space Telescope was launched; the serious flaw that was discovered when it began to send data; and how and when this flaw was fixed.
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Astronomy

05/17/21

The wavelengths of the electromagnetic spectrum viewed by HST, and why HST is better than earth-based telescopes for studying objects at these wavelengths.
The wavelengths of the electromagnetic spectrum viewed by HST, and why HST is better than earth-based telescopes for studying objects at these wavelengths.
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Astronomy

05/11/21

Are any planets or the moon visible? If so, which ones and where in the sky are they?
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Astronomy

05/11/21

In what way are the compass directions (N, S, E, W) different from the way they appear on a street map? Why is this?
I need help understanding this
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Astronomy

05/07/21

college lever astronomy
What is the distance and apparent magnitude for Antares?802 pc and 1.32.7 pc and -1.5170 pc and 1.0197 pc and 0.4
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Astronomy

05/07/21

college lever astronomy
What is the brightness ratio for Antares at 10 pc?1/2891/17^2none of theseeither of these
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Astronomy

05/07/21

college lever astronomy
Any star's brightness ratio when 'moved to' a new distance, or any star's brightness when compared to any other star, has an associated change in Apparent Magnitude; this is based on another simple... more
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Astronomy

05/07/21

college lever astronomy
The true distance to Sirius A (simply called Sirius from here on) is about 2.5 parsecs.TrueFalse
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Astronomy

05/07/21

astronomy college level
Based on the Inverse Square Law, what is the brightness ratio for Sirius?1:1616:1any of these1/16
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Astronomy

05/07/21

astronomy college level
What is the magnitude difference for Betelgeuse at 10 pc?6.5063882.5197^2
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Astronomy

05/07/21

astronomy college level
What is the approximate Absolute Magnitude for Sirius, now that we have corrected for its distance?2.5-1.51.51.0
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Astronomy

05/07/21

astronomy college level
What is the brightness ratio, and associated magnitude change for Deneb at 10 pc?1/802 and 2.51/80.2^2 and 9.571/6432 and 2.51/802 and 9.57
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Astronomy

04/29/21

Really bright or hot stars on the HR-diagram plot to the lower right.

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Astronomy

04/26/21

Would a star with a radius 16 times that of the Sun, but a surface temperature 0.5 times that of the Sun, be more, or less luminous than the Sun?
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Astronomy

04/17/21

If our moon only had an angular dimeter of 1/16th of a degree, how many arcseconds would it subtend
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Astronomy

04/15/21

astronomy questions
if an ellipse has an eccentricity of 0, then what must be true of its component numbers, and what is the shape of this ellipse ?
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Astronomy

04/15/21

astronomy questions
the eccentricity of an ellipse is always a fraction, btw 1 and 0, and it has no units.true/false?
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Astronomy

04/15/21

astronomy questions
Kepler's 2nd law states that a planes sweeps out equal distances from the sun in equal time intervals.false/true ?
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Astronomy

04/08/21

question for astronomy
The positron produced in the first step of the pp-chain almost immediately finds an electron and annihilates, e − + e + → γ. How much energy is released by this reaction? mγ = 0.
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Astronomy

04/08/21

question for astronomy
The pp-chain is the primary way that stars like the Sun burn hydrogen into helium. It is a sequence of nuclear reactions whose net effect is to turn four protons into a helium nucleus (alpha... more
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03/10/21

Does Plato have a theory regarding ancient astronomy?
I know that Plato has a lot of theories regarding philosophy but does he have any theory about ancient astronomy. I need it for a presentation please answer
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Astronomy

02/26/21

in the book and then there were none How does Agatha Christie build suspense in chapters 12-14
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Astronomy

02/01/21

Consider a Hot Jupiter with a temperature of 3009 K orbiting the star Vega. At what wavelength in nanometers) would the Hot Jupiter would be brightest?
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