45
votes
Accepted
Do we know a star that is similar to the Sun when it would be a red giant?
Models for the future behaviour of the Sun do vary, mainly as a result of uncertainty of mass loss during the red giant (H shell burning) and asymptotic red giant (H+He shell burning) phases.
A ...
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16
votes
Do we know a star that is similar to the Sun when it would be a red giant?
Arcturus is a RGB star, probably fairly similar how the Sun will look when it becomes a red giant. Arcturus is slightly more massive than the Sun ($m_{\rm Arc}=1.08 m_{\odot}$), but the main ...
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8
votes
As the Moon and the Earth are predicted to get into tidal lock, how slow would the Earth rotate?
The last part of the answer you linked to actually says (right at the end) that tidal locking will never be achieved, with reasoning similar to what I gave in this answer.
That said, even though the ...
- 4,864
6
votes
Accepted
Has a gravitational microlensing event ever been predicted? If so, has it been observed?
In the pre-Gaia era, this was effectively impossible to do, since positions and proper motions weren't precise enough for a large enough sample of stars. With the release of Gaia data, though, it has ...
- 4,864
5
votes
Accepted
Predicting accurate time of local sunrise in mountainous area?
The PeakFinder app1 can do most of what you're looking for. It's available for Android and IOS as well as through a web browser. The app shows the paths across the sky for both the sun and moon2 and ...
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4
votes
Accepted
With only seemingly two measurements 30 minutes apart, how were astronomers able to determine that asteroid 2022 EB5's trajectory intersected Earth?
The object was already so close to the Earth that in the 30 min time difference between the observations it moved already 1/4 of the way further to the earth (from about 21 Earth radii distance to 16 ...
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4
votes
Accepted
How to predict future position of body in solar system (without Kepler's equations, N-body problem)?
You can't.
An N-body system with n>2 is (in general) chaotic. This means that any inaccuracy in the initial state of the system will grow exponentially.
You can't get a rough estimate of any ...
- 116k
4
votes
Is it possible to predict a supernova with years or decades of advanced notice?
While a whole slew of signals will arrive once the supernova actually occurs, from neutrinos to light of all different energies and wavelengths, the outward, visual appearance of the star will not ...
2
votes
Could science be lost if a phenomena is observed before predicted?
The question leaves me confused on how to interpret it. As some of the comments have noted, observations have routinely predated a theory that (accurately) predicts them. In astronomy and cosmology ...
- 3,260
2
votes
Are the Leonid meteor storms a thing of the past?
Wikipedia does not cite a source.
NASA used to make predictions, eg.:
2009 LEONID OUTBURST FORECAST A significant shower is expected this year when Earth crosses the 1466-dust and 1533-dust ...
- 1,396
1
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As the Moon and the Earth are predicted to get into tidal lock, how slow would the Earth rotate?
Most of the answer is wonderfully written above by Eric Jensen. I shall only add one final touch. As demonstrated by Eric, synchronisation is attained when the Moon's orbital period reaches $P_{then} =...
- 1,241
1
vote
For any given meteor shower in a given year (e.g. Quadrantids, now) where can I see a rough prediction of how many days it will last?
The International Meteor Organization publishes an annual Meteor Shower Calendar.
The PDF document for 2020 predicts a Quadrantid peak on January 4, 08:20 UT, and says:
The peak is short-lived with ...
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1
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Is it possible to predict a supernova with years or decades of advanced notice?
Instead of asking the question "when will it explode?", you can instead ask "when will it appear in our sky?". The latter question can actually be predicted reasonably accurate in ...
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1
vote
Accepted
Is it possible to predict a supernova with years or decades of advanced notice?
"..phenomena like solar flares can be predicted"
It depends on weather. Solar weather. And timescale.
BUT you cannot predict it's motion. Solar dot measure, any of this form - is unpredictable. It may ...
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