New answers tagged

0

Supposing that the mass of the object is negligible compared with the mass of the Earth, you can derive the orbital period $T$ from the 3rd Keplero's law: $\frac{T^2}{a^3} = \frac{4\pi^2}{G(m_E + m_b)} \approx \frac{4\pi^2}{Gm_E},$ where $a$ is the semi-major. With $T$, for each time istant you also know the mean anomaly $M$, given by (suppose $t = 0$ at ...


3

The short answer to your question is "decades", only for Mars, and only a two Mars decades (about 4 Earth decades) I don't know if your question was related to climate change, as there were a number of extremely unscientific arguments made that Pluto and Mars are getting warmer, "and there are no SUV's on Mars" . . . so, maybe it's not the CO2 but those ...


0

Pluto is currently cooling down, since its distance from the Sun is increasing now, a few years after perihelion. That's seasonal. Mars has been suspected to warm up. But as far as I know, that's questioned in the meanwhile.


2

There are many resources online, so I'm making this a community wiki answer. Please feel free to add to it! If you want to visualize the stars/planets/etc (as viewed from Earth or another location), you are looking for planetarium software: https://en.wikipedia.org/wiki/Planetarium_software If you want accurate positions for stars/planets/etc, you are ...


0

Yes, Gaia makes extensive use of this technique. The measurement accuracy of star positions for the brightest stars is 10 to 20 micro- arcseconds – up to 100 times better than that the precursor mission, Hipparcos; this angular resolution corresponds to the observed diameter of a Euro coin on the Moon, viewed from Earth. The underlying principle is the ...


2

General relativity can be used to discuss, theoretically, what happens to objects as they approach the event horizon of a black hole; it all has to do with your point of view. Outside viewers, those not affected by the gravity of the black hole, would view an object approach the event horizon slowly and pretty much never enter past the horizon. For the ...



Top 50 recent answers are included