How big does an asteroid have to be to damage?
Ultimately, scientists estimate that an asteroid would have to be about 96 km (60 miles) wide to completely and utterly wipe out life on our planet.
What is the largest asteroid to hit Earth?
The Chelyabinsk meteor was estimated to have caused over $30 million in damage. It is the largest recorded object to have encountered the Earth since the 1908 Tunguska event. The meteor is estimated to have an initial diameter of 17–20 metres and a mass of roughly 10,000 tonnes.
How heavy is a comet?
What is the mass of a comet? Assuming a density of 1 gm/cc, typical for water ice, then this comet would have a total mass of 5 x 1017 gm = 5 x 1014 kg. Comets lose mass with each passage through the inner solar system …
What are the 4 parts of a comet?
A comet is made up of four visible parts: the nucleus, the coma, the ion tail, and the dust tail.
What percent of a comet is ice?
Famous comets The roughly potato-shaped, 9-mile-long (15 km) comet contains equal parts ice and dust, with some 80 percent of the ice made of water and about 15 percent of it consisting of frozen carbon monoxide.
How do comets have ice?
Most of the ice in our solar system, including the ice in comets, is water ice. As the comet gets close to the Sun, the carbon dioxide ice will vaporize before the water ice. So, after thousands of years, even though the two kinds of ice were initially mixed together near the surface, only the water ice remains.
Does a comet have water?
Comets are mostly water ice. It could be that comets made regular water deliveries to Earth. Asteroids contain some water too, so they may have contributed.
What is the name of the Green Comet?
Green Comet Milkweed (Asclepias viridiflora Raf.) Green comet milkweed is in the Asclepiadaceae (milkweed) family, one of about 115 milkweed species that occur in the Americas.