They asked for global participation in “Asteroid Day,” an event to be held June 30, 2015, the 107th anniversary of the Tunguska event, an explosion caused by an incoming asteroid or comet that flattened more than 2,000 square kilometers of forest along the Podkamennaya Tunguska River in central Siberia. Asteroid Day is thus intended to raise awareness over the threat from Earth-crossing asteroids. They read a declaration about the danger our planet faces from impacts by small solar system bodies, a document signed by 100 important scientists, astronaut-explorers, entrepreneurs, and celebrities. They described activities that will take place next June to further raise awareness.
Near-Earth asteroid 433 Eros spans some 33 kilometers in its longest dimension. This object poses more of a threat than most large asteroids because its orbit comes close to Earth’s.NASA/JPL/JHUAPL
Scientists report the discovery of an exoplanet — a planet outside our own solar system — about as large as Neptune that circles its young star in just over a week.Learn how researchers used NASA’s Transiting Exoplanet Survey Satellite (TESS) and retired Spitzer Space Telescope to report the discovery: https://go.nasa.gov/2YFzYYF
Continental cloudPaul Shulins from Sunapee, New HampshireThe North America Nebula (NGC 7000) pairs with the Pelican Nebula (IC 5070 and IC 5067) in the constellation Cygnus the Swan near that star pattern’s brightest star, Deneb. Both are large emission nebulae whose hydrogen atoms re-emit energy from nearby stars as red light.
Comet C/2020 F3 (NEOWISE) springs a naked-eye surpriseFireworks weren't the only thing to light up the night sky over Independence Day weekend. Comet NEOWISE has joined the party, and you can still see it in the morning sky.
Comet C/2020 F3 (NEOWISE) shows its bright green color and developing ion tail in this deep image taken from the Republic of Namibia in Southern Africa.
Dubai vai construir uma cidade marciana em pleno deserto
Comet C/2020 F3 (NEOWISE) springs a naked-eye surpriseFireworks weren't the only thing to light up the night sky over Independence Day weekend. Comet NEOWISE has joined the party, and you can still see it in the morning sky.By Mark Zastrow | Published: Monday, July 6, 2020RELATED TOPICS: COMETS | OBSERVING
Comet C/2020 F3 (NEOWISE), as seen from the White Mountains of northern New Hampshire on the morning of July 7, 2020. The comet's gossamer tail could be seen arcing away from ever brightening horizon.
Hot Jupiters may form close to their starsGiant planets circling their suns in a matter of days could form in place, rather than migrating inward, as previously thought.
Hot Jupiters are massive gas giant planets circling their suns at a fraction of the Earth-Sun distance in our own solar system.
An elemental problem with the SunFor two decades, astronomers have argued over how much carbon, nitrogen and especially oxygen lie within our closest star — a dispute with implications for the entire universe.
The exact chemical composition of the Sun, which is seen here in this image taken by NASA's Solar Dynamics Observatory, is still a point of contention in astronomy.
The Minotaur Series of rockets developed by Orbital Sciences corporation probably incorporate some of the oldest bits of hardware currently launching things into space. The Minotaur 1 is based on old Minuteman II boosters, while the Minotaur IV uses old Peacekeeper boosters. These use missiles which were decommissioned and placed in storage decades ago, but with some quality checks they're cleared to fly again and carry government payloads into space.
Saturday, July 18The Moon and Mercury lie close together in this morning’s sky, just over 9° apart an hour before sunrise. Mercury is low in the northeast, rising higher as dawn approaches. Shining at magnitude 0.9, its disk is 26 percent illuminated and just 9" across. The waning Moon is a mere 6 percent illuminated.Presenting an easier target, Venus is also nearby, nearly 20° high in the east. It’s a blazing magnitude –4.7, far outshining orange Aldebaran about 4° to its west in Taurus the Bull. The Moon will pass close to Venus later in the week.The Moon passes 4° north of Mercury at midnight EDT tonight, although the pair is below the horizon when this occurs.
Comet C/2020 F3 (NEOWISE) floats amidst a waterlike pattern of noctilucent clouds above Wales in mid-July. This week is an excellent time to spot both the naked-eye comet and these unusual clouds.Jamie Cooper