Our Universe: Elemental Flashcards
What was the first element?
The first elements — hydrogen and helium — couldn’t form until the universe had cooled enough to allow their nuclei to capture electrons (right), about 380,000 years after the Big Bang
The very first stars likely formed when the universe was only 100 million years old, less than 1% of its current age. These first stars were so massive that, when they ended their lives as supernovae, they tore themselves apart and seeded interstellar space with a distinctive blend of heavy elements.
The very first stars likely formed when the universe was only 100 million years old, less than 1% of its current age. These first stars were so massive that, when they ended their lives as supernovae, they tore themselves apart and seeded interstellar space with a distinctive blend of heavy elements.
The very first stars likely formed when the universe was only 100 million years old, less than 1% of its current age. These first stars were so massive that, when they ended their lives as supernovae, they tore themselves apart and seeded interstellar space with a distinctive blend of heavy elements.
When was the first star made
The very first stars likely formed when the universe was only 100 million years old, less than 1% of its current age. These first stars were so massive that, when they ended their lives as supernovae, they tore themselves apart and seeded interstellar space with a distinctive blend of heavy elements.
How did the first stars form in the universe?
The universe primarily consisted of neutral hydrogen gas floating in an omnipresent sea of background radiation leftover from the Big Bang. Over time, gravity slowly shepherded the densest regions of hydrogen gas into compact clouds, which ultimately collapsed to form the first stars.
What are turtle shells made of?
These are made of keratin (Calcium and phosphorus), just like your hair and nails. Who knew you had so much in common with our reptilian neighbors. Contrary to popular belief, a turtle’s shell is actually a part of the animal, like a bone. A turtle’s shell is its armor and its ultimate protection from many of the dangers of the world.
How many sea turtles make it to adulthood
Few survive to adulthood, with estimates ranging from one in 1,000 to one in 10,000. Sea turtles’ natural lifespan is estimated to be 50-100 years.
What percentage of baby turtles make it to the ocean?
Across all beaches, 7.6% of the observed hatchlings did not survive to reach the water. Mortality sources varied by location. Observed predators include: mammals, birds, and crabs.
What is carbon explain
Carbon is a chemical element, like hydrogen, oxygen, lead or any of the others in the periodic table. Carbon is a very abundant element. It exists in pure or nearly pure forms – such as diamonds and graphite – but can also combine with other elements to form molecules.
What is DNA structure notes?
How do sea turtles find their birthplace?
Sea turtles use the earth’s magnetic fields to navigate back to the area where they were born decades earlier, according to a new study that used loggerhead genetics to investigate their travels.
How do sea turtles find their way back home?
By studying nesting sites in Florida, a team from the University of North Carolina has discovered that the turtles seek out unique magnetic signatures along the coast. As hatchlings, they imprint on the magnetic field of their natal beach and then use this information to return as adults.
How do sea turtles find their way back home?
By studying nesting sites in Florida, a team from the University of North Carolina has discovered that the turtles seek out unique magnetic signatures along the coast. As hatchlings, they imprint on the magnetic field of their natal beach and then use this information to return as adults.
