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Mysterious asteroid from beyond our solar system probably came from a place

first_imgESO/M. Kornmesser Click to view the privacy policy. Required fields are indicated by an asterisk (*) Mysterious asteroid from beyond our solar system probably came from a place with two stars Late last year, astronomers spotted the first object to enter our solar system from interstellar space—a somewhat reddish, cigar-shaped body named ‘Oumuamua. Now, a new study hints that this exotic interloper most likely began its voyage after being cast out of a double-star system.Astronomers first classified ‘Oumuamua (Hawaiian for “scout”) as a comet, but later observations didn’t reveal the telltale signs, including clouds of dust or water vapor. That, plus the 400-meter-long object’s high speed and odd trajectory, strongly suggested that ‘Oumuamua was an asteroid, not a comet, from beyond our solar system.But very few single-star solar systems would be able to cast out a waterless object like an asteroid, a new study suggests. That’s because such a feat would require gravitational interactions with a planet the size of Saturn or larger, something present in only about 10% of single-star solar systems near us in the Milky Way. Country * Afghanistan Aland Islands Albania Algeria Andorra Angola Anguilla Antarctica Antigua and Barbuda Argentina Armenia Aruba Australia Austria Azerbaijan Bahamas Bahrain Bangladesh Barbados Belarus Belgium Belize Benin Bermuda Bhutan Bolivia, Plurinational State of Bonaire, Sint Eustatius and Saba Bosnia and Herzegovina Botswana Bouvet Island Brazil British Indian Ocean Territory Brunei Darussalam Bulgaria Burkina Faso Burundi Cambodia Cameroon Canada Cape Verde Cayman Islands Central African Republic Chad Chile China Christmas Island Cocos (Keeling) Islands Colombia Comoros Congo Congo, the Democratic Republic of the Cook Islands Costa Rica Cote d’Ivoire Croatia Cuba Curaçao Cyprus Czech Republic Denmark Djibouti Dominica Dominican Republic Ecuador Egypt El Salvador Equatorial Guinea Eritrea Estonia Ethiopia Falkland Islands (Malvinas) Faroe Islands Fiji Finland France French Guiana French Polynesia French Southern Territories Gabon Gambia Georgia Germany Ghana Gibraltar Greece Greenland Grenada Guadeloupe Guatemala Guernsey Guinea Guinea-Bissau Guyana Haiti Heard Island and McDonald Islands Holy See (Vatican City State) Honduras Hungary Iceland India Indonesia Iran, Islamic Republic of Iraq Ireland Isle of Man Israel Italy Jamaica Japan Jersey Jordan Kazakhstan Kenya Kiribati Korea, Democratic People’s Republic of Korea, Republic of Kuwait Kyrgyzstan Lao People’s Democratic Republic Latvia Lebanon Lesotho Liberia Libyan Arab Jamahiriya Liechtenstein Lithuania Luxembourg Macao Macedonia, the former Yugoslav Republic of Madagascar Malawi Malaysia Maldives Mali Malta Martinique Mauritania Mauritius Mayotte Mexico Moldova, Republic of Monaco Mongolia Montenegro Montserrat Morocco Mozambique Myanmar Namibia Nauru Nepal Netherlands New Caledonia New Zealand Nicaragua Niger Nigeria Niue Norfolk Island Norway Oman Pakistan Palestine Panama Papua New Guinea Paraguay Peru Philippines Pitcairn Poland Portugal Qatar Reunion Romania Russian Federation Rwanda Saint Barthélemy Saint Helena, Ascension and Tristan da Cunha Saint Kitts and Nevis Saint Lucia Saint Martin (French part) Saint Pierre and Miquelon Saint Vincent and the Grenadines Samoa San Marino Sao Tome and Principe Saudi Arabia Senegal Serbia Seychelles Sierra Leone Singapore Sint Maarten (Dutch part) Slovakia Slovenia Solomon Islands Somalia South Africa South Georgia and the South Sandwich Islands South Sudan Spain Sri Lanka Sudan Suriname Svalbard and Jan Mayen Swaziland Sweden Switzerland Syrian Arab Republic Taiwan Tajikistan Tanzania, United Republic of Thailand Timor-Leste Togo Tokelau Tonga Trinidad and Tobago Tunisia Turkey Turkmenistan Turks and Caicos Islands Tuvalu Uganda Ukraine United Arab Emirates United Kingdom United States Uruguay Uzbekistan Vanuatu Venezuela, Bolivarian Republic of Vietnam Virgin Islands, British Wallis and Futuna Western Sahara Yemen Zambia Zimbabwe Email By Sid PerkinsMar. 19, 2018 , 4:45 PM Sign up for our daily newsletter Get more great content like this delivered right to you! Country But solar systems that have two suns, especially those in which the stars orbit each other tightly, are much more likely to cast out asteroids, the researchers report today in the Monthly Notices of the Royal Astronomical Society. The team’s computer simulations suggest that up to 36% of binary stars can eject asteroids. When the researchers take into account the numbers of single-star versus binary systems and the numbers and sizes of planets they’re likely to have, they estimate that more than three-fourths of the asteroids cast into interstellar space come from solar systems that have two suns.last_img read more