Fossil
what is a fossil
A fossil is any preserved remains, impression, or trace of any once-living thing from a past geological age.
what are black holes
A black hole is a region of spacetime where gravity is so strong that nothing — no particles or even electromagnetic radiation such as light — can escape from it.
What is a nebula
A nebula is an enormous cloud of dust and gas
Why are some brown stars?
Brown dwarfs are substellar objects that are not massive enough to sustain nuclear fusion of ordinary hydrogen (1H) into helium in their cores
How old is the Earth?
4.543 billion years
How do we know the age of fossils
Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.
Do black holes suck everything in?
Black holes don't suck. Suction is caused by pulling something into a vacuum, which the massive black hole definitely is not.
What causes dust and gas to pull together and form a protostar?
Stars are formed from massive clouds of dust and gas in space. Gravity pulls the dust and gas together to form a protostar.
How are brown starts from?
A cloud of dust and gas collapses, gravity piling the components in tightly and forming a young protostar at its center.
How do we know the age of the earth?
The best estimate for Earth's age is based on radiometric dating of fragments from the Canyon Diablo iron meteorite.
are fossil rocks?
Fossils are not the remains of the organism itself! They are rocks.
What is Event Horizon in a black hole
A black hole's “surface,” called its event horizon, defines the boundary where the velocity needed to escape exceeds the speed of light, which is the speed limit of the cosmos.
Which two things balance and keep a main sequence star in equilibrium?
While self-gravity pulls the star inward and tries to make it collapse, thermal pressure (heat created by fusion) pushes outward.
What is a brown star?
A brown dwarf star is a sub-stellar object whose mass ranges between that of gas giant planets and small stars.
who discovered the age of the earth?
Clair Cameron Patterson
can fossils decompose
For an organism to become a fossil, it must not decompose or be eaten.
Do black holes really exist?
There is consensus that supermassive black holes exist in the centers of most galaxies. The presence of a black hole can be inferred through its interaction with other matter and with electromagnetic radiation such as visible light.
What is nuclear fusion?
Why is a brown dwarf not a planet?
So brown dwarfs are not planets, and they are failed stars, not massive enough to power hydrogen fusion reactions
What was the first age of the Earth?
Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula.
how do fossil form
Most animals become fossilized by being buried in sediment.
Who discovered black holes
Karl Schwarzschild
Where do elements heavier than iron form?
Elements heavier than iron are produced mainly by neutron-capture inside stars, although there are other more minor contributors
how hot is a brown star?
These new findings suggest the coldest brown dwarfs are between about 260 and 350 degrees Fahrenheit (125 and 175 degrees Celsius).
What is the age of life one earth?
3.5 billion years ago