Fred
  • Member for 2 years, 8 months
  • Last seen this week
  • Southern Hemisphere
How many iridium layers do we know, besides the K-Pg one (the dinosaur killer "smoking gun")?
Accepted answer
15 votes

There are other iridium anomalies, particularly the Devonian-Carboniferous boundary (D-C boundary), about 350 Ma ago. The K-Pg boundary is only 66 Ma old. Just because there is an iridium anomaly ...

View answer
Why is there a zig-zag in elemental abundances?
8 votes

A very informative, short, You Tube video discusses this - see the 4:20 mark. Apart from hydrogen, helium, lithium and beryllium, all the elements were formed as the products of fusion in stars. If ...

View answer
Origin of heavier elements on earth?
8 votes

Different types of stars are responsible for creating different groups of elements via nucleosynthesis. Most of the "lighter" metals (Na, Al, Ga, Ge, Se), were formed by exploding massive stars, and ...

View answer
If Betelgeuse is exploding in 2022, why would we see the explosion in 2022?
Accepted answer
7 votes

Light travels at a finite speed, 299 792 458 meters per second. Hence the term light year is the distance it takes light to travel in one year. Most of what is observed in the cosmos occurred some ...

View answer
Crust thick enough to prevent volcanos
Accepted answer
5 votes

It depends on the definition of Earth-like planet. In terms of size, density and gravity Venus is very Earth-like, but in terms of atmospheric and surface conditions and its axis of rotation, and ...

View answer
If I was in a coma and woke up at night in the desert, what knowledge would I know instantly and after 30 days?
Accepted answer
4 votes

OK! So it's night time in the desert. If it is hot or very warm it's summer, even at night. If it is cold it's most likely winter. If it is a pleasant temperature or mild, it's anyone's guess. If you ...

View answer
Can fish and other sea creatures survive in watery planets like Neptune or any other planets that has water?
Accepted answer
4 votes

Being an ice giant, there is no water on the surface of Neptune. Having a surface temperature of $-201$ $^oC$ any water on Neptune will be frozen. Extraterrestrial liquid water is believed to be ...

View answer
Improving portability of truss Newtonian
3 votes

I have two options, but the experts might not like them. The first is to replace the carbon fiber poles with telescopic tubing similar to that used for camera tripods, but maybe a bit more robust. The ...

View answer
Why did Venus not lose its atmosphere without a magnetic field?
3 votes

A contributing factor to Venus' atmosphere is that Venus may still be geologically active. Any carbon dioxide emitted during volcanic eruptions will be adding to the atmosphere. If the rate of ...

View answer
Is there a general term used to identify the high flat features within Noctis Labyrinthus on Mars?
3 votes

The geological term mesa has been used to describe these structures. A transitional zone on Mars, known as the fretted terrain, lies between highly cratered highlands and less cratered lowlands. ...

View answer
Is there a way to tell the difference between earth andesite from Mars
2 votes

Only two meteorites have been found on Earth that are composed of andesite. They were found at the Graves Nunataks ice shield in Antarctica during a US Antarctic search for meteorites in 2006/07. The ...

View answer
Are there rampart craters elsewhere in the Solar System?
1 votes

There are some rampart craters on Earth: Ries crater in Germany, Bosumtwi crater in Ghana, Tenoumer crater in Mauritania, Lonar crater in India, and Meteor crater in the United States Additionally, ...

View answer
What are the benefits of collecting asteroid samples in situ rather than just waiting for bits of asteroids to fall as meteorites?
1 votes

We could be waiting a very long time, if ever, for a particular asteroid to impact the Earth. Using probes to take sames from asteroids gives a sample from a particular asteroid within a quick time ...

View answer
Refinement to sun/wristwatch estimate of N/S direction
1 votes

The method is generally reliable between 9 am and 3 pm. The other consideration is when one is using the method in either of the tropics: Cancer or Capricorn. It is generally accepted that in the ...

View answer
What are some dark features on (or qualities to) the moon?
1 votes

The plural are mare is maria, so Maria might be a good name for kitten/cat, particularly given the unnamed one is a twin. Also, olivine is common mineral on the moon, as it is on earth. Olivine is ...

View answer
How to install Distro Astro operating system?
1 votes

Distro Astra is a Linux distribution for Astronomy. Unless you are very familiar with Linux distributions be vary careful about installing it you main computer. If you have an old computer not being ...

View answer
Who is Seyfert, and what is "the so-called Seyfert flare"?
1 votes

Answering the who is part of the question. Carl Seyfert (1911-1960) was a US astronomer. He is best known for his 1943 research paper on high-excitation line emission from the centers of some ...

View answer
Looking for an interactive star chart
0 votes

If your friend is happy to use a tablet device while in the tub your friend could download the Heavens Above app, select the Interactive sky chart option, enter the co-ords or the name of the nearest ...

View answer